Class A amplifiers - which are considered the best

Audiopax Maggiores - 100W - Class A - SET (my pair arrives this weekend).

Plinius SA-103, SA-Reference

Anyone have experience with those two?

The amps run in AB mode but can be switched to Class A at the flick of a switch. Plinius claims this allows the amps to be powered ON all the time. You just flick it to A before listening. And after a period where there's no input signal, it switches back to AB.

Sounds neat.

Pass XA gets so much overwhelming love here I will give my +1 to Luxman. I replaced a Pass XA-30.5 with a Luxman M-600a and haven't looked back. Similar, but better all around for me. Like the sound, the build quality and craftsmanship is also more refined.

Have not heard a lot of those mentioned but heard and bought the Wyetech 211 M and have not heard the like but am open to.

If you like pure Class A solid state, these Mark Levinson ML2 monoblocks are it if you can find a pair, note the amount of heatsinks just for 25 watts of class A (no a/B) and they get HOT!!!. Goes to show that others are stretching a long bow when they quote class a figures with pitiful heatsinks and quotes of 100 watts of class A. What they're really saying is a small amount of class A up to a point then class b the rest of the way.
Have a look at these beauties.
http://www.wtconcept.com/levinsonml2/

Cheers George