Yes, I have a slightly modified TriPath Class D amp rated at 60 watts/channel @ 4-ohms and 100Wpc @ 8-ohms. The power supply caps were replaced with higher capacity capacitors and it sounds wonderful. In fact, it replaced my QuickSilver GLA tube amp driving my Magnepans... It plays louder without strain and sounds as good if not better in some ways. I do use a VTL 2.5-TL tube linestage into it.
My other system is totally solid-state (except the phono preamp) and uses a Wyred 4 Sound STI-500 ICE-Power amp, which sounds better than any other amp I've tried in that system... including a Cary Audio CAD 120S tube amp and some very good solid-state amps.
I believe the digital amps are the future and they don't need to cost a ton of money to sound great. They are incredibly fast and ultra-detailed, low-noise, and can be just as musical and engaging as other types of amps. Plus they're lighter, smaller, and way more efficient than conventional tube or solid-state amplifiers. It's a win-win, in my view.