I've bought zzh! to use it as a router, to extend coverage. Before buying even contacted the seller to make sure everything will work, but never got any response.
And guess what, the router functionality is not working. You can flash the firmware without any problem, but the stick will not connect to the existing network, the coordinator does not see it. The problem is already reported on GitHub, but for the last three months, nothing happened ( https://github.com/Koenkk/Z-Stack-firmware/issues/260 ).
So, if you need a stick that will work as a router, look for another product.

Kari | Feb. 7, 2021

Useless

For zzh! CC2652R Multiprotocol RF Stick

The device is unusable with zigbee2mqtt. To get that stick started up proberly takes at least 2 hours while waiting moon phase to hit correct spot.. or something. It just always gives this error "(Error: SRSP - SYS - ping after 6000ms)".

Just want to warn that this device is not suitable to use with homeassistant + zigbee2mqtt.

Response from Electrolama | Feb. 7, 2021

Hi Kari,

Sorry to hear that you're having problems. We could have tried solving this over emails if you got in touch, shame you decided to leave a negative review instead.

I've developed this stick to be used with zigbee2mqtt (and Home Assistant) specifically as that is what I am running for my setup here. As far as I can tell the majority of all customers are indeed using the same combination of hardware and software for their setups as well (see reviews below). Therefore, your warning is not accurate.

If you're interested in finding a solution to your problem, feel free to email support@electrolama.com.

Alexander | Jan. 21, 2021

Poor signal quality

For zzh! CC2652R Multiprotocol RF Stick

I received the zzh! CC2652R with some delay, but this was expected and communicated on tindie.com. The device has a poor signal quality. I use the zzh! stick with a Raspberry Pi 4 and I use it with a USB extension cable in 1m distance from the Raspberry. Nevertheless the signal / reception quality is bad. In 5m distance and one wall between (same floor), the signal quality is already at 20, and in 8m distance and 2 walls between (same floor) the signal quality is 0.

I reported this issue twice to the support eMail of Electrolama, but no help/answer since 2 weeks.

Response from Electrolama | Jan. 22, 2021

Hi Alexander, I don't see any open/unanswered tickets about signal quality issues (nothing in our spam folder either). Are you emailing support@electrolama.com?

I don't have any means to get in touch with you here as Tindie reviews just show your comment as "Alexander" with no order number or email attached, if you'd like to get in touch please either send us an email or use the Tindie messaging facility.

Maxime | Dec. 25, 2020

Not working

For zzh! CC2652R Multiprotocol RF Stick

The dongle doesn't work, I got an error when i try to flash it.
Shipping OK
I can't use it, money wasted

Response from Electrolama | Jan. 22, 2021

Hi Maxime,

It's a shame you didn't get in touch before leaving a negative review as we would have gladly helped you troubleshoot your issue.

We do test every single stick before it leaves the factory and for a second time through random batch testing before dispatch so if you'd like to go through some troubleshooting steps to see if the stick is indeed "not working" or whether it is a firmware/software issue, please send an email to support@electrolama.com.

Alan | Nov. 26, 2020

Great but

For zzh! CC2652R Multiprotocol RF Stick

Really excellent bit of hardware, the real pain comes with flashing it for Zigbee use. The instructions are really poor, finding the firmware to flash is harder than it should be, and did I say the instructions are really poor (in fact plain wrong) leading to many hours of frustration. Started out trying to use Windows = no way, so installed Linux on a virtualbox. A lot easier with Linux but still the instructions were wrong, took a lot of playing to finally find the secret and it flashed dead easy. Either these need selling pre-flashed or much better and correct instructions provided.

Response from Electrolama | Nov. 26, 2020

Sorry to hear you've had bad luck with instructions, if you could drop me an email at support@electrolama.com I would be keen to hear where you think I can improve them as they have been working for me (I'm on Windows) and many others as well, going by the reviews below. Particularly interested in what you think was "plain wrong" and what the secret was that got it working.

Also, just double checking that you were following instructions at https://electrolama.com/projects/zig-a-zig-ah/ as there have been cases where folks were using other resources and complaining about missing instructions. For instance, here is the section from that page that talks specifically about what firmware to flash: https://electrolama.com/projects/zig-a-zig-ah/#zigbee2mqtt

John | Oct. 17, 2020

I was disappointed.

For zzh! CC2652R Multiprotocol RF Stick

The RF sticks come with no built-in functionality and the documentation is sparse and contradictory.

Response from Electrolama | Oct. 17, 2020

Sorry to hear that you're disappointed, wondering if you've missed the link to the actual documentation though as a lot of folks have had great luck with it so far (as suggested by other reviews). For your reference it is at: https://electrolama.com/projects/zig-a-zig-ah/

zzh sticks ship with just a test program (this is clearly noted in the item description) and comprehensive instructions on how to flash a firmware of your choice is detailed in the documentation linked above. For your convenience, here's the direct link for flashing instructions: https://electrolama.com/projects/zig-a-zig-ah/#flashing-using-bsl

If you're still having problems after reading the documentation, please send an email to support@electrolama.com and I'll do my best to help.