Personally, I prefer valve amps for the natural sound and the hitting power. I used my Cornford at last weekend gig and the guest guitarist used a Valvestate 250. He got completely lost in the mix and I was only running at 1/2 gain and 1/3 volume in a biggish hall. It was the opposite in a previous band where I used a Spider Valve 100 and the other guitarist had a DSL50. You just couldn't heard me at all until I was turned up way too loud. It's a matter of personal preference, and some great tones can be got out of those AVT's, but for me, there's no substitute for a valve or (tube) amp. As for maintenance, I'd contend that if a solid state amp goes "pop" circuit-wise, there's very little the Average Joe could do to fix it. Valves you can change yourself for the most part. Also, if you want to change the colour of your tone, it's not too difficult with a valve amp, some amps even let you change valve types (e.g from EL34 (British Marshall sound) to 6L6 (Fender blues sound) ) without the need for rebiasing. Solid states amps have their advantages too - they tend to be more relaible, quieter and are usually much lighter. Some of the newer ones have a wide range of tone options via amp modelling - e.g Line 6 Spider and Flextone. As for hybrids, I've played through and owned a few and none of them really cut it for me. I owned a Bogner Alchemist and a Hughes & Kettner Switchblade, both of which had onboard effects - if that puts them in hybrid territory. Both were very good amps. Having said all that, I know a few guys who gig regularly with AVT's and are more than happy with them.