I have heard a good bit about them. They are semi local to me. They are supposed to be pretty nice for a relatively inexpensive coilover. They are all assembled I the us and rebuildable in house which is very nice.
I have two problems though
1. The BMW tax is kind of ridiculous as the suspension is a very simple design (nearly identical to my gti). If you were to get 510's with swift springs you'd be looking at 2k and there are better options for that much money.
2. Their 1 series spring rates suck, but they do offer free custom rates which is a great deal (I just wanted to warn you on that point)
2007 //M Coupe. BSM. Fabspeed headers. Catless. BMS x-pipe. Strömung cans. evolve tune. Eventuri intake. Airrex air suspension with autopilot v2 management.
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