I have a 99 Rockhopper comp hardtail, which came with a Manitou Spyder R (63mm travel I think?). I upgraded the fork with a 2002 Marzocchi MXC 100mm air and it was an unbelievable upgrade. It did lift the front of the bike by a fair bit and the steering is a little slower, but the extra fork control is excellent and by lifting the bb, I can now clear some of those logs on the trail I previously couldn't.