I use both a Hegel h160 and a small Keces E40. For my speakers the Hegel is definitely overkill. The biggest difference I hear between these 2 amps are on my Dali speakers. The voices have a bit more pop and sometimes glare in movie soundtracks where I think sound is processed differently than music, perhaps better resolution and the piano strikes a bit more livliness, adding to the weight and speed of notes whereas the Keces rounds the sharpness, it's smooth, warmer side of neutral by a hair and adds bass heft, enough speed and texture that alot of inexpensive amps do not. It shows in the damping factor measured from a site I found. The hegel is the better amp by power, specs, etc., but the little Keces E40 does not fall far behind in SQ in my systems.
Enough so that I may sell the Hegel h160 in the coming weeks as I do not plan on upgrading my speakers at this time. I wanted mini systems that perform and I now have 2 Keces E40s using decent under a grand dacs. The 2 systems offer a bit of a different flavor, using Dali and Triangle speakers. Even if I upgrade my speakers, they will still be small standmounts such as Closer OGY or a few other small ones which the Keces should still drive well.
Can't say enough good things about the little amp and prefer it over Rega and a few others in its category I have heard but there are alot of decent and reasonably priced amps out there. The Van Alstine CA/NP amps are getting attention , there's Galion, among some others that should hold value over time. But if you find a used Keces for cheap, grab one. Even at retail I think its worth it. Looking at the power and caps you wouldn't think it could sound this good. Just stay at or above 4 ohms. Going below that I think produces too much heat. Hard to drive low sensitivity speakers won't get loud. But it will drive them within its power band.
FWIW.