Good communication. Product works as described.
Everything seems fine - I asked the seller to customize it (i.e. build it with Samsung 35e cells, and different charge & discharge connector), which was no issue. The cost was was more obviously, but still great price. (Since it has a waterproofing silicone sealant at the cable entry which I don't want to redo, I have not opened it to check inside, if I find something wrong when I do open it, I'll update this review if I can.). It seems OK (have not checked inside though), though I would have liked to see heatshrink on the cables where they go into the XT90. The delivery was somewhat long (a month and a bit), but I'd perhaps assume it's just shipping randomness and it's not normally that way. They ship it into Europe in some way that doesn't get taxed, (and doesn't have tracking), and then ship it with UPS locally.