I recently built a Class A 35wpc power amp based on the First Watt design. The Class A was much better but I also use the best parts available and point-to-point wiring. I also recently upgraded a few Counterpoint hybrid power amps with bipolar transistors with Class A output and the difference was much better. It added more clarity, depth, dimension and faster dynamics. You have to try them out for yourself as always. I agree with the posts above mine.
Happy Listening.