I had the original 15 inch combo.
Besides always fighting with it to get a sound I liked, it kept shorting out at the power switch.
Reliability was now a serious issue. I could no longer trust it. So, out it went.
I now own the original 152 cab and was considering the S.T.U 1000 amp to go with it but since there's no way I can try before I buy, and its a heck of a lot of cash to spend on something that reliability may still be in question, I'm forced to trust my gut instinct and stick to the amps I already own. At least I know they work.
I can't speak for amps of the past but I lean towards believing there are some quality, reliability, issues that need to be rectified with today's modern amps...maybe it's a disposable world mindset in production that causes this, maybe it isn't.... but I digress..