It's been in service for a couple of months now with no problems. Tweaks are pretty much done. Initially it was driving a Peavey Black Widow 1508-SPS & moving pretty good LF air.
Now, I have a 2nd 15" cab with a WGS 15" bass guitar speaker loaded. I've also got a quad of 6550s ready to go.
So the answer to the original question, "Will it be loud enough" is: h*** yes!