The slacker geometry and wheelbase of a full on downhill bike puts it at a disadvantage. It's just not a comfortable and effecient riding position. I have taken out my Foes Fly with full race setup(boxxer WC, durace cassette, dual plys) for trail rides and done quite well keeping up with the others(partially due to its 36lb weight, sub 36 with singleplys), but when you stand up to do a climb and try to weight the front tire with bars in your lap it's not as great as a trail bike. The lengthy 45+ wheelbase makes turning tight technical corners more difficult.
I'm a big fan of the Foes FXR. Incredibly capable bike. Three of us local guys own Foes Fly's and love them for DH racing. However, since 2 of us got the FXR's it's been the bike of choice for everything. Trail riding, shuttling, even downhill racing. The bike pedals great with the Curnutt XTD coil or air or the DHX air. The geometry is adjustable via a rod end at the end of the shock to lower the bb and slacken the ht. However none of us have changed the geometry settings. Using a adjustable travel fork(we've got a 36 talas and a lyric u-turn) makes it absolutely amazing.
One of the guys actually sold his nomad to buy the FXR.