Forum:Health Regen Viable?

Hello everyone, FlyingSquirrel here.

I was just looking at some pistols and I noticed http://borderlands.wikia.com/wiki/Atlas_Troll ,,, Seeing as survivor class mods can regen health as well as shields is it possible to stack these up to the point of being virtually unkillable? Little curious as to how useful this could be and if it would be worth it or not. Especially for solo'ing things.. Survivor Mod + Very Quick Heatlh Regen + Atlas Troll?

Please give me some opinions if anyone has them, or hard numbers if someone feels like doing the math