What are the advantages to a Class A amp & what are the trade offs?

Thanks guys. I knew about the heat and power demands. Wasn't sure what sonic advantages it might have. There is a Canary M70 which has drawn my attention. Its in the power range which I have found to work well with my speakers. Its close to my budget. But i can't find any reviews or much info about it. If i can recoup my $$$ I've been known to take a chance. Sometimes you lose. But sometimes you hit it outta the park. Then too, its may be a  sideways move. I'm kinda itching to pair another amp with my new Preamp (CJ CT5). System sounds Great but I can't seem to leaver it alone.

@bdp24 
I learned long ago that the low powered amps sound better to me. I've had amps for 35wpc to 250 wpc. The 35wpc sounds best in my system. Unless one is pushing an 84db speaker load, high wattage is not needed. Even then, the low power may work. The amp I am considering is 40wpc and has pushed the 84db speakers

I listen to music every day, I glance at my electricity bill once a month. :-)

I like that. Sounds like something I'd say

@larrykell 

Coffee is another area that the masses could care less about. Give em Dunkin Donuts and they think they have the best. I used to take my own coffee on vacation & when we went to see family. I'm sure They thought I was a coffee snob. I'd offer them some but they just didn't get it since it didn't taste like theirs. I never did get into the expresso though. I don't really know enough about it

@mapman  I think you have given  a good explanation of what i was trying to find out. I have the efficient speakers which somewhat piqued my interest in class A

@atmasphere  Thanks Ralph. Fwiw you have a way of making the complex easy to understand. Are/Were you also a teacher?