I still use nimh in some cars. I use lipos in others.

All the hype about the dangers of lipo is, IMO, mostly internet scare tactic bs. Sure, a lipo can cause a house to burn down but so can the fork you eat dinner with. Use them as they are intended and you'll be fine. Besides, you use lipos everyday. Own a cell phone, laptop or anyother small electronic device? Yes? Then chances are real good that you are using lipo batterys.

On a related note...
All the battery powered hand tools like drills, saws, drivers, etc that are going to lipo seem to me to work less well than their old nimh counterparts. I've used several different brands now and the lipos all seem to have less power and less run time than the older nimh batterys. Yes, they are smaller and lighter but untill I see some improvement in how they work and last, I'm sticking with nimh in my hand tools. Which works well anyway because now, nimh has dropped in cost :-)