[quote name='scalpy' timestamp='1454869434' post='2973764']
Another anecdote but a friend techs for Cradle of Filth. A few years ago he said it was fingers crossed every country as you see what dual rectifier is provided. I told him I thought they were pretty much bullet proof (apparently a requirement playing some venues in South America!) but he said by the time you factor in valve life, temperatures, quality of flight case and age you've got no idea. So he bought a kemper, hires it to them and the sound is the same from São Paulo to Siberia.
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I well imagine that Kemper and Fractal have been so popular with touring musicians because the units can fit in a suitcase. It might not be quite as good as the perfect "real" amp, but it's probably a lot better than a knackered version.
A mate of mine has swapped his enormo-rack for the Axe-Fx and a Matrix power amp. He tours all over the world and as long as he asks in advance it's easy to find a Marshall 4x12 locally.
He's got a pair of the preamps so he has a back up, and the transport costs are tiny compared to what there were.