I do not have experience with them, I got in contact today with them.
Mostly suppliers are very helpful before buying. As i read on the forum aftersales is a thing....
Started with a small setup in Feb with one aolithium 5kwh battery and quickly learned that's not enough. Did alot of looking and finally ordered the wirentech 5kwk server rack batteries. They are UL listed, built in breaker, LCD screen, comms, $1000CAD each. They checked all my boxes. They arrived May 10. Mounting brackets got bent on shipping but otherwise seen to be working. Cells are +/- 10mv of eachother. I opened one up, can't really see to much or what kind of cells.