I have three rides on these subtanks now and I can't begin to say how impressed I am with them! They are a high quality item and super-easy to install (10 minutes).
I own a 2007 CRF450 with a Too-Tech Canada revalve and I weigh 195 pounds. I ended up adding 20cc of fork oil (to bring my level up to 380cc) to get the best combination of plushness and bottoming control. With this level, I don't come close to bottoming the fork until I get to 7 turns out on the tank adjusters (8 turns out is max).
On the track, they give so much confidence when attacking rough sections and the forks still soak up the big hits (overjumps/flat landings) too. The further I turned out the adjusters, the faster my lap times got. After riding for a while with the tanks set at 6 turns out, I closed the adjusters. In effect, this "turns off" the subtanks. After doing this, I rode some laps and I could not believe how harsh the suspension felt. I thought my suspension was good before the subtanks with just the revalve but this is the icing on the cake! I guess I did not realize how much better my suspension could get.
Jason from Framebreaker Racing provides great customer support and builds a great product. Two enthusiastic thumbs up from a happy customer!!