Fox's completely new down hill ready DHX range took over from the classic Vanilla and adds several new features.
The main gain is adjustable Pro Pedal low speed compression damping. This means you can dial out any pedal bob very simply with just a few clicks of the big adjuster wheel. The clever pressurised 'Boost Valve' increases compression damping and bottom out in the later part of the stroke, while final bottom out and speed sensitive rebound can also be adjusted externally. Despite all this tuning potential the Fox DHX still blows open to handle the big square-edge hits on stubborn rocks with ease when you need it. The coil shock runs really smooth from new too, so your upgrade will be effective for immediate trail abuse.
Fox importers Mojo offer extra tuning before or after you buy as well, and they also carry a huge range of shock sizes and springs, including compatible titanium coils to knock a bit of weight off.