I've seen these things floating around on Ebay and Amazon. Not a lot of information on them that I could find. Has anyone tried them and/or know anything about them?
Thanks!
I have a number of them and wrote a driver for them too (although I think a generic driver would work now)
Whilst very cheap and the seem to work really well, it has been found that some of them do not repeat well.
I have problems with one of mine whereas the other 3-4 seem to repeat well
They will repeat xiaomi devices too.
Andy
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Thank you @Cobra!
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I have... I think 5 of these. I have not seen issues (I use the generic driver) BUT mine are not normally connected. I have built them into our larger inflatables to control at Christmas. So besides initial pairing and original testing (before and after building them in) they have sat idle.
I would personally be hesitant for any indoor, built in use. But I figured if one of our inflatables outside goes up in winter, there is less risk for us.
I am using two of them for existing Florescent Light Fixtures. They have been working great for a while. Don't seem to be causing any repeating issues.
Hehehehehe @snell I should have known!
Thank you!
Thank you @tgrant48!
I've been using one, and it works just fine, although it does not reliably report back its state (I've used a virtual switch to shadow it).
I have no idea whether or not it repeats OK, as I'm not expecting it to - it's inside a metal bathroom ceiling fan case, so I'm just happy it works at all. 
You can also look at the Sonoff BASICZBR3 which functions the same way and no issues with it reporting state after the last HE update.
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Interesting @at9. At least that one seems to have a brand on it. 
Thank you!
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I’ve got a couple of the ‘unbranded’ units and a coupe of the SonoffZBR3’s and there’s really nothing between them, functionally. They both work great BUT I’d get another Sonoff if I needed more as they’re smaller at about 1/2 the size and are better built.
I have 3 of them. Very reliable and my Aqara stuff loves them for repeating purposes. And cheap, via Ali...
Thank you all for the info! It really helps!
I wasn't sure where to post this, especially since I ended up getting the Sonoff, but I figured I could hijack my own thread.
Well, I got my Sonoff BASICZBR3 last week and hooked it up and it was detected as the Zue Zigbee Switch and works great as a switch. It was interesting that they had different wiring diagrams for light bulb vs LED vs fan. My use case is for a fan, and I'm wondering if maybe the BASICZBR3 has like a dimmer / speed setting which is not exposed by the Zue driver. Does anyone happen to know? Or do you know how I can find out?
Thanks!
No it is just a relay. The LED diagram is just showing to connect it to the driver and the light bulb is demonstrating a single live wire that routes that doesn't connect the neutral back through the relay.
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Thank you @at9! Well, I'm happy with it. Time to get a few more for my projects. 
I got a Sonoff... and the pairing button came right off the board. When I tried to solder it back on it turns out that the points on the board themselves had come free with the button so there was nothing to solder it back to. Minus one Sonoff... Just wish I had tried using it when I first got it and not saved it in a bin for so long. Oh well.
Just be careful not to bump that long button too hard apparently (or at all I guess in my case, not sure if it was a manufacturing defect or it somehow DID get bumped, so I do not hold it against them). So many people seem to have good luck with them that I think it must have just been my own bad luck. 
Just by way of comparison, I’m finding the the “OnOff Controller” model is a much more powerful repeater than the SonoffBasic ZBR3’s.
Good to know. Thanks @njanda!
Yeah I've found the SonoffBasic ZBR3’s to have limited range maybe only 10m, line of site.
I've even toyed with the idea of getting one to modify with an external antenna wire to attempt to get more range.
