It depends on the digital amp, certainly. The benefits of size, heat rejection, and energy consumption (all of which relate back to the greater efficiency) can be very appealing, but I'd have to have a decent payback from the energy consumption and cooling load before I parted with my 7500.

There have been some very good digital amps built, from what I've read, but typically you have had to pay more per watt - sometimes a lot more - to offer comparable performance (as seen with something like Axiom's eight-channel amp, although some older examples have an even more extreme cost differential). The cost penalty is narrowing, I think, but there can still a pretty decent differential. Dvenardos' Virtue Two is an example of this: the 7100 sold for something like $900 and offered a total of 700 watts at 8ohms (just under $1.29 per watt), while the Virtue 2 offers up to 60W per channel for two channels at a price of $500 (or 40W per channel for two channels at $380, depending on the power supply you get). That's actually a pretty good price for a high-performance stereo amp, but it's still somewhere between $4.17 and $4.75 per watt. There are several reasons for the price difference, but using a digital chip while still rivaling good class A/B amps is likely a significant contributor to the extra cost per watt.