The Good: This bike is a great all around bike that can do it all. I have rode this bike in some of the heavy downhill trails of Colorado and had little problem on technical climbs and descents. I use this bike mostly as a cross country bike in the midwest. I can still kill climbs going up and also can handle heavy descents in the same ride. The brakes perform great and I like the slack geometry, makes it easy to get that front wheel up.
The Bad: There is a little bit too much bobbing on the climbs and because of the type of suspension, there is a lot of chain feedback, which causes some trouble with shifting. I need to tune up the bike more often because of this. The rear suspension is a bit soft, so I find myself bottoming out more than I might want, but I prefer stiffer suspension, so that might just be me.
Overall this is a great all mountain bike that is great on climbs and descents. I like the bikes more slack geometry, like on many giants. If you are a road rider, a trek's more leaning forward type of position mat be more comfortable. Also, this bike isn't good for drops or riding around the neighborhood, but of course this bike isn't made for that.