"The U3 utilises 4 of Bitmains latest generation BM1382 chips in high quality, domed case."
Doesn't look like a domed case, but more importantly the latest generation is the more efficient BM1384 so perhaps Bitmain is getting rid of old stock.
Getting rid of old sock via creating a mini miner made for a hobbyist seems like a good idea to me. Hopefully it's legit stable.