ok, my final verdict is in on these things. i finally found a good track setup & went racing last thursday. bottom line: these are pretty good. first, a caveat: i am a VERY consistent driver, so i feel comfortable comparing my times with various equipment.
my previous best time at this track was a 1:12.7. this was done on the bridgestone RE-01R tire (1.01G standard grip) with the M030 springs, GT3 front sway and H&R rear sway. i had NO passenger and was running on fumes; the car was as light as it gets on track.
this time i was running on Fuzion ZRi tires (0.93G standard grip). these tires are generally about 7 or 8 tenths slower at this track than the RE-01R's. my first laps out, i had a full tank of gas AND a passenger; i ran ~1:13.2's. later in the day, i got down to less than 1/2 tank of gas and no passenger. also, i'd learned to drive this particular setup a bit better. i turned a 1:12.2. so, i turned a time that was 1/2 second faster on SLOWER tires. when i adjust for the tire difference, my net gain on the same tires would be about 1.3 - 1.4 seconds a lap (1.41 mile course). that is a HUGE gain for some one looking for tenths. i think i could have even done better had i had one or two more sessions.
the car is PHENOMENAL to drive now; i really loved it at the track. last time out, it was set up WAY too loose for me. this time, i went half a click softer on the rear sway and evened out my tire pressures. PERFECT!
around town, i feel like i have a setup that is reasonable enough for daily use. on the track, it's only going to get better as i refine the setup parameters.
anyone still interested in a group buy, PM me and i'll work on getting it setup. once i have the number of sets we're talking about, i'll get pricing information. i can say at this point that i recommend these coilovers, but that you should expect a STIFF car!
for those interested, here is some video from thursday:
http://www.vimeo.com/2136507
FYI, the first lap is warm-up. the car in front of me is a 3.8L 964 race car on hoosiers. i am in a 2.5L boxster on fuzion street tires. notice he's not pulling away THAT quickly.