This is a really great sensor Mark has produced and continues to develop. Meshing a 400x400mm bed with this sensor takes less than 20 seconds. It is also very precise. In my experience it is able to accurately and repeatedly measure to 0.005mm (5 microns). I have had a few problems integrating this sensor, Mark has very graciously helped me work through them in separate github issues and I have not had any further problems over several hundred hours of printing. Thanks again Mark!

Unfortunately never received the sensor checked on the tracking this morning to find out it was supposed to be delivered 4 days ago. So I can't really rate the product l.

I had always thought that the Espressif ESP32 MCU would make an interesting controller for a 3D printer and when I ran across an ad for the PandaZHU board it seemed like it was worth a try.
The board sports a ESP32 WROOM-32 mcu module with built-in Wifi and BLE connectivity. Additionally it has an I/O expander to provide enough I/O's for up to 8 TMC2209 stepper driver's.
Generally speaking it is a good design with all the features that a high end 3D printer controller should have.
I ordered the PandaZHU board with 5 TMC2209 stepper drivers and the 3D Touch (BL Touch knockoff) bed level sensor.

Upon receiving the board I found that only 4 heatsinks were provided for the 5 stepper drivers. Additionally I noticed that jumpers on the X stepper driver were damaged. As an aside, the limited documentation available for this board does not describe the TMC2209 jumper functionality and one is left to study the schematic and TMC2209 datasheets.
Next I found that the board had an internal short on the E0 stepper driver connector so obviously the board had never been tested beyond a possible power up.

The documentation also ignores any mention of the wiring for the 3D Touch sensor. This is not a huge issue but is telling about the quality of the documentation.

The Marlin source code for this board is based on release 2.0.8 but I couldn't find any documentation that discussed migration to future releases. This is significant because the PandaZHU control of stepper drivers is proprietary and is not directly supported by Marlin firmware so moving to another release would be a real challenge without any instruction.
Maybe the maker of this board will supply future source code bundles but it doesn't seem likely given the lack of attention for detail.

Also worthy of note, the ESP32 module's built-in antenna is located next to one of the boards mounting screws which reduces the antenna performance if using metal screws. Best to use nylon screws for mounting.
I emailed the maker of these boards with my list of issues but received no response.

Summary: Design is OK and general build quality is average but the lack of product testing, lack of customer support, and very poor documentation is a serious detractor. I gave it 2 stars but I was in a good mood.

I have several 3D printers and worry that these machines can cause a dangerous fire in my home. I don't drop my guard and still monitor them for safety but I rest easier with this in place. I gave the product a 5 for communication because I was not able to submit the rating without adding a star. Please note that I never reached out so I do not know if this company provides good support. It would have been unfair of me to rate the company poorly but I feel like I am cheating people that use ratings to make decisions. Again, be advised that I NEVER communicated with the company.

I purchased this board and tested on my printer.
Updating and flashing firmware is a never-ending process, no proper documentation,
We don't know whether updates and printer necessary settings have flashed to the board or not, it may be working for designers printer
but not with all.
Not recommended, stick to Octoprint if required you better upgrade you printers motherboard to make it usable with Octoprint.