Problems. Not that i've heard of. The Bonehead was designed with the 'assistance' of Toto's Steve Lukather so it's gonna sound good right?
The Rake was built for ace LA session guitarist Jay Graydon. There are plenty of reviews of the knucklehead on Harmony Central. I like Rivera amps but they are a step down in the 'fiddley' stakes to a Boogie. Whenever I see someone using a Boogie or a Rivera, they appear to spend half the night twiddleing the knobs, switching the switches and pushing and pulling the boosts.
As usual, a lot of care and maintenance is required by someone who knows what they are looking at.