The Good: Lighter than most 4" travel 26er FS frames/Awesome geometry/51mm offset fork decreases trail, while mitigating increased slack/ABP rear pivot is beefy and super stiff/Plush, 4.33" (110mm) of rear travel/Asymmetrical chainstays/Thick downtube and BB equals 100% forward thrust/Carbon frame armor/Equally great climber descender/Stock Bontrager saddle is actually nice/Rock Shox fork with dual air simply rocks
The Bad: Dated, 2010 tech on front derailleur mount(direct mount/type 2) adds grams/Full-length cable housing for front shifter does not optimize correct cable pull ratio/"Big Sweep" bars feels like a Beach Cruiser/Bontrager RXL 29er wheelset weighs a whopping 2000grams/SRAM XX brakes is unsafe and unreliable - ditch them/Rear Fox shock with Kashima coating is high-maintenance
After 2010 Gary Fissure Superfly 100 frames were deemed a complete reliability nightmare - Trek corrected everything for 2012, by reinforcing unidirectional carbon layups in all affected areas, without compromising weight. Trek also mandated 142x12 rear axles, further beefing up rear stiffness and stability. The ABP rear pivot works as claimed, greatly minimizing tire skidding and keeps the suspension fully active under hard braking.
Overall - the 2012 SF100 Pro is a dream on two wheels; it climbs almost telepathically. Baby head rock gardens suddenly turn into frozen peas and carrots, allowing you to confidently blaze through them like a 7" travel Freeride bike would. Thanks to the short wheelbase - it executes tight switchbacks like a 26er does. Everything about this bike screams SPEED. I've ridden the BEST of the BEST 29ers out there(S-Works Epic 29/Santa Cruz Tallboy/Turner Czar/Yeti SB95/Niner Jet9 RDO/Ibis Ripley/Intense Spider Comp29/Rocky Mountain 999 RSL/Scott 910) and this bike still has the most balanced of all trail attributes, combined with workable light weight.
It's still not perfect - but damn near close....