I posted a lot in the thread that T_Dilley gave you.
I think if you are over 225 lbs or like to jump the quad a lot, they will be too soft for you. Otherwise, they are a HUGE improvement in ride over the stock springs and well worth the price. I have the complete set of prototype springs on my orange V and a lower spring rate rear spring on my green V that was also part of the prototypes.
damn, im 6.1 235 too fat for the springs, geuss i need to push the bike around the yard for a couple weeks to loose some <winter weight>. i dont jump much.is there anything inbetween factory and too soft? I hear about 450 springs wonder how that would work out?
You will like the Road Magnet springs better than the 450's. I had KFX450r front shocks on my green V for a while and they were pretty soft. You might be OK with the Road Magnet springs. I have a friend who rides my orange V with no real problems and he is about 285. They ARE a bit soft for him, though.