I also have a supernova 250S. I like it, it works great on my Nicad packs. I've had some trouble with it false peaking on small Nimh packs though, and I usually have to set it to "Nicad" to make the NIMH packs charge fully. When I bought it, it was a great deal as far as bang-for-the-buck goes, but right now, if I was buying new, I'd buy something with Li Poly and a better track record with NIMH cells. But for me, anyway, the supernova's ability to do 1-25 cells is way cool. I use the 1 cell ability to field charge my nistarters when I forget to do them at home. It's happened more than once.