I have a 06 RTX with the big boy spring. I go about 3 bills dressed to ride.
I ride semi agressive on the trail, meaning I don't jump it off snow banks or any other sno cross type activity, but when the trail gets bumpy on a Saturday afternoon I squeeze the throttle a little harder because as someone else mentioned it seems to ride better if you take the bumps at speed. In that time I've had the following damage:
2 front arms broken. 1 cracked, the other broke in about 4 spots.
1 cracked rail
1 broken RA adjustment cable.
1 ripped track (from the front pivot arm breaking and digging into the track)
Obviously my weight is a big factor. If I dropped about 100 lbs I'm sure I'd see less breakage, but the skid just isn't designed for aggressive riding in my opinion. It'll feel great all the way until it fails. Having the beef up kit done is going to help also.
I probably would've swapped out to a 07-10 RTX skid if I liked how they rode, but I don't. Too stiff in my opinion. I just try to back off a little and remind myself I'd rather suffer a little more through the chop and big bumps than replace another track or pivot arm.