Expectations after re cap of power-amp

My 1982 Yamaha M-2 power amp is in the shop and this time I agreed to replace all the suspect capacitors. Two of the capacitors are the size of coffee cans and the total bill may exceed $500. I am told that since all the replacement parts will be as good as or better than the original parts it should sound as good as new or better.

I’ve never done this before.  Should I expect “as good as new” or am I completely wasting my money?