As I posted a while back in this thread, the Puma500 has the best 'power amp limiting' I've ever heard. It stays totally even, and just 'stops getting louder' after a while when really pushed... no quashing, no clamping, no compressing of tone, nothing. It's wonderful.
It's one darn impressive amp, and I like it more and more as I get it in more playing situations. That creamy tone and low mid punch, combined with that uber clean, hi fi top end just makes my single coil Sadowsky J sound PERFECT

It's almost like having a very high end studio compressor in the signal chain... very subtle, but the peaks just sound clean, balanced and beautiful when you are pushing the amp (slapping, etc.).