what, you've never heard of 40's? Or maybe your just looking for people to say "dude, that's such a sick fork! your so lucky, I wish my mom would but me one!" C'mon man, Fox's top of the line fork is just that, Fox's top of the line. If you like Fox they're rad. On the other hand out of 4 of my friends who ride a 40, 3 of them have snapped the lowers at the arch... you decide...
yeah - honestly its what you ride.. if you like DH get boxxers.. if you like the all around its a toss up between a 40 and a 888.. in my opinion i might go for a new 2008 888 but i dont have the money and im not one to complain with my 40's- try riding the bike and you might see what its like- dont listen to other people to make your decision on a fork
40s are not very freeride friendly UNLESS you are prepared to do lots of maintanance. Its an air fork, and all air forks require lots of tlc, especially 40s; 40s have super low levels of bath oil in them (hence the light weight) which means they dry up, and if the oil isnt splashing around (like it would on a smoother FR jump trail, as opposed to a rough DH course for example, where they are constantly going rough a full range of travel) to lubricate the stanctions, they scratch pretty quick unless you regularly service them. As far as freeriding goes, theyre stiff, and predictable, however they do not ramp up as much as actual freerid forks will, the damping system in them is race specific. You have to know how your fork will react to prevent damage.