I really like Avatar. The cabs are constructed well of quality materials. I do not feel that they are not over-constructed like Mesa products which will survive a nuclear war, but they are built every bit as well as many other brand named manufacturers. I have a Vintage 4x12 mixed with Hellatone 60's and 30's (V30's and G12H30's that are broken in). The other guitar player in my band has a Bogner 4x12 with V30's and it looks identical. He likes the sound of mine better as it has a better low end and is less prone to unpleasant highs (probably the characteristics of the speaker mix).
The thing I like about them is that when you buy them new, you can choose from a number of speaker configurations. To that end, you might want to check what they have in there. They also mount their speakers in a way that allows you to easily swap them out in the event that you want to experiment. This is from their website:
"The four 12's are rear loaded with T Nuts which makes it easy to swap out speakers for tone experimenting. "
I can't remember the owner's name, but he's the guy that answers the phone when you call and is very easy and pleasant to deal with. I don't care that my speaker cab doesn't say Mesa or Marshall or Bogner. It sounds great and that's all that really matters.