I've got a stock Boxxer RC 2011 on my bike, and I'm not overly impressed with it's damping. On fast small bumps it tends pack down, and on big hits it bottoms out.
As it's only got overall external compression and rebound adjusters, I can only help one scenario or the other. My mate has the model up (R2C2), which has both the upper and lower travel adjusters for each type amongst others, and it seems to have vastly better performance. However, having serviced both of them, it looks likes much of the difference is in facilitating the extra external adjusters (not all though).
So my question is: Will I get vastly superior performance out of it by sending it away to have the damping cartridge custom tuned to my weight and riding style? Or is it a bit naff by design, so bite the bullet and fork out for an Avalanche/Elka upgrade cartridge (they're custom tuned upon ordering anyway)?