I've been playing my ABM500 EVOII RC head for more than two years now without a problem. It's loud, offers a versatile yet simple EQ. The lows are huge, the mids can be anything from clean to crisp and the highs are clear but not overly bright. Along the lines of Ampeg, but better in every way.
I also love the tube preamp and mix control and the sub feature is cool to add some beef to small cabs. A little touch of sub also works magic on a recorded studio track.
I think it offers a nice compromise of sound/volume vs weight and it's priced honestly.
I've also played the MAG heads a lot and I think they are one of the best value on the market. I'd gig with one anytime. They are more mid-present than the ABM line and have a very "in your face" sound. A student of mine has a MAG300 with an Aguilar GS112 cab and it sounds awsome!
As for reliability, yes there were problems in the past (I count myself in this) but I feel they are getting better.
One thing I'm sorry about is that a lot of people gets their impression of tone affected by a reliability problem. How many times I hear "It sounded like sh*t and was defective". Normal...it was defective. Two seperate things.
Regarding customer service, I've always been treated like a star from Martin at ashdown UK.
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