An extract from an email from a guy of here who got a coil one from TF Tuned.
"I've only ridden the bike with the pushed Van R on one xc ride so far ( apart from playing in the road) , so my opinions are based on this.
I got the coil shock for various reasons,
1 Im mainly wanting to ride gravity asisted and jumps nowadays
2 Got fed up of having to adjust air settings/worrying about air leaks etc.
3 taking the bike to morzine for 2 weeks to dowhhill , at wich it will cope better.
4 wanted to fit and forget
Im extremely pleased with the shock , Its in another leauge to air shocks in
small bump sensitivity.
The cannondale phrophet has a regressive suspension design , so to stop the shock
blowing throug all the travel all the time , the shock has to bet custom shimmed to stop this happening also Tf put a cone shim in the damping circuit to stop bottom out all but the hardest landings.
The performance of the shock all depends on how you explain to Tf how you would like it.
Ie if you want a lot of pro pedal on it ( to stopp pedal bob ) they can shim it that way.
If you dont mind the extra 300 grams its a much more reliable option that an air can."