There's two different companies that supercolts may be referring to with those initials 'MA'
There
is MA Audio...which build some nice amps and they also build some entry-level garbage from what I have seen/heard around my hometown.
There is also Massive Audio, which the original poster asked about when he posted the MA in the first place. I have no direct or indirect experience with any of their products so I cannot comment on whether or not their products are worth buying.
Boss and Pyramid I wouldn't recommend to anyone. They don't do anywhere near claimed output levels and I've yet to see anyone raving about the reliability of any of their gear.
Personally I wouldn't recommend Lanzar but I've seen more than a few remarks about one or two different series of Lanzars (I seem to recall the Vibe series mentioned somewhat often?) being decent for the money. Maybe someone with a bit more experience with Lanzar products will be along shortly.
Audiobahn makes okay stuff, I suppose. You'll find they aren't particularly popular on this forum as well as many others due to Audiobahn seemingly spending the lion's share of their R & D budgets on applying the most "BLINGAGE" to their products rather than investing those funds into actually producing a solid piece of audio equipment. IMHO your money is better spent elsewhere.
I've never used any Power Acoustik gear myself but they seem to have a pretty loyal following. The general consensus seems to be big, fairly reliable wattage for not huge amounts of $$$. I reckon they might be worth a look.
If you're looking for some cheap, reliable amps look to Profile. They're my "goto" amplifier when I need some reliable watts for little cash. You can get some of their gear off of
their website direct pretty durn cheap and even paying retail through
Crutchfield won't break the bank. I've owned several in the past and loved them all. I'd recommend them to anyone on a budget.