I own a LF5XT and I've owned Novatac 120P's in the past. In my experience, the Liteflux light has worked flawlessly since I received it. I returned my Novatacs because of the inherent software issue (the company's diagnosis, not merely my opinion) that caused flickering at lower and upper levels.
My conclusion is that, sure, the Novatac lights had a heavyweight body and a stainless bezel ring, but the Liteflux works when I need it to work, and the progamming options are second to none. So, I consider the Liteflux light better able to withstand use. I don't know about abuse, given my experience, but my LF5XT is made with high-quality components- lots of metal parts and nothing flimsy. It seems to be well made overall. I would depend on it in a pinch, and I'm fairly picky. Again, I might never have the opportunity to see how the Novatac holds up to abuse, because I'll be carrying a Liteflux light, or a Ra/HDS light in critical situations - not a Novatac, unfortunately.