I was having issue with ConbeeII so I decided to switch to this item. In less tan 4 minutes i was up and running. My Home Assistant installation work perfectly and I have no issue with Ikea and Xiaomi products.
The dongle has been now up and running for a week now - absolutely fantastic. Not a single problem.
Compared to my previous dongle (CC2531), I can pair devices (I have 56 pcs currently) directly to the dongle (although obviously some wanted to connect via a router device) and the range is much higher. I don't have LoS to any device, dongle is in a storage room, minimum 2 walls to outside, still a battery operated device (Smartthings button) works at least 30m away, at the edge of my property. That is way farther than with previous dongle, which had trouble even indoors (just a note, I have some Xiaomi sensors that don't like to be rerouted - pairing directly to dongle ensures there is no rerouting. Thus the dongle range makes a difference).
Attached documentation is limited, and links to zigbee2mqtt.io -pages anyway. Installation and pairing couldn't have been simpler. Shipping was prompt, but took 2 weeks from Italy to Finland using standard shipping.
Communications with the seller is excellent, quick responses to queries.
Response from Giovanni's Domotica Store | Nov. 8, 2020
Thanks for your review, firmware is Koenkk zStack 3 latest version. Yes you can upgrade the firmware but you need to use a JTAG programmer as explained in my tutorial on the official website --> https://www.zigbee2mqtt.io/information/flashing_the_cc2538.html I'm currently working on new release of this hardware that shoudl allow USB flash of new firmware using a special bootloader, but it's still under prototyping...
I run it now for 4 weeks. It works direct out of the box. The amount of devices it can handle is indeed much better than the basic CC2531. It supports all my 35+ devices. The data process speed is also much faster. The only con is the range, it is not significant better than the CC2531 with antenna but with some extra smart sockets I can extend the range. Overal I'm very glad I bought this stick.
Response from Giovanni's Domotica Store | Oct. 31, 2020
Hi Ronald, thanks for your review, all in all positive, I'm sorry your coverage improved by small amount, I can assure you I use a chip with -20db power amplifier and each dongle is tested, I can only assume you have some big "ostacles" (like walls or concrete pavement) that can have serious impact on the signal strenght.