I have two sets of them. One on my WRX wagon, and one that just came off the blue RS. I plan to use the "extra" set with some GC coilovers for STX on the WRX.
I've had the set that's already on there for a few years. Lots of rallyxing and street driving with them. Still working great. Huge amount of damping adjustability. Don't feel exactly like Konis, but Konis would've been broken years ago, just like the last two sets I had.
There was a thread about them in nasioc motorsports forum, and the Koni snobs said they weren't good autox dampers, judging from the damping curves. (they hadn't actually used them, just looked at the graphs)