keke, i've got no language barrier issues with masterkit... je parle francais. your tracker will be higher, so the risks of rollover in extreme conditions will be higher, just like any other higher vehicle on the road but taking corners and so on you will not feel like you might tip over. overall though it gets things out of the way on the trail much better due to the clearance under your rocker, you'll get a solid 3 inches under there! very usefull in my opinion. davyboy makes a good point about the wheel spacers and stability. i have no spacers, stock wheels and a 9.5 wide tire, still have the sway bar on, dd mine everywhere i go and have no issues, before the tracker i drove a lowered mustang, other than being taller the ride quality is about the same! go for it!
should also mention that if you plan to play hard at all, you are going to lose those plastic bumpers from time to time and have to re-attach them, the plastic is junk that you will have to keep messing with. but that's just a personal thing, they do look better attached but i painted mine up with bed liner and they look alright. do a quick search, there is another thread specifically about the masterkit body lift.