I have a set of MVP Pro Lift stands (like these, but older:
Amazon.com: Pro-LifT T-6903 Grey Jack Stand - 3 Ton Capacity: Automotive) that I use with smaller vehicles and a set of taller stands made in the 1970s with no discernible name on them that I've used for years. I'm actually not even sure what weight they are rated for, but they are built heavy. There's some solid wisdom in this thread no matter what stands you're using:
1. Don't trust your life to anything holding up a vehicle. Use jack + stand + wheel + and maybe more in some situations. Go even crazier when you're lowering or lifting heavy things into/out of a vehicle (trans, engine, axles, etc).
2. Be safe. It's fun and rewarding to work on vehicles, but your parents, spouse, kids, friends, etc need you around. That five minutes you might save isn't worth it. When you start to think it is, it's time to take a break.
Those sunex stands look impressive, but I think they're too tall for the work I do. (at least the 10 ton version)