i guess the Santa Cruz Tallboy is the HOT HOT HOT bike of the season, so i took a Tallboy out last night...
first off, i'm a small man, 5"5'. second, this is the first time i've ridden a 29er on trails. third...the bike was a bit large for me (it was a medium, we didn't have a small). all that said...
i'm not a fan of the bike. the good thing about the bike was step ups/going up obstacles, the bike was easy, i just had to pedal, very little pushing the bike and moving my weight around to get up stuff. that seemed to be the only worth while quality of the bike.
it did climb well, but i felt like i had to keep up good momentum to move those huge tires. the bike handled ok on twisty singletrack, not the most agile bike ever, and it wasn't the most comfortable. it overall felt heavy and clunky, and when i hucked off stuff, it felt...heavy and sluggish.
it would be a good bike for riding many relatively flat miles, for touring, for riding/stepping up large obstacles, and for keeping your wheels on the ground. if you intend to catch any amount of air, jump off stuff, or want to ride fast tight single track, i don't' think it would be the best choice.
perhaps if i were taller, perhaps if the bike were a bit smaller i may have liked it a slight bit better, but i felt like i was on a tallbike. right now, as it stands, i'm not a fan of 29ers and i am not a huge fan of the tallboy.
all this is just my (pretty worthless) opinion, you probably will feel much differently. i'd like to hear your thoughts on the bike.