It depends on what you're looking for. I have one, because it fits into the glovebox and weighs almost nothing. It has more than enough power for my needs, which admittedly aren't geared toward SPL. YMMV
IIRC, Elf Audio sells a model based on a very similar design, as does another firm whose name I can't recall ATM. Both are as small or slightly smaller than the ARC. Before I bought the MINI last summer, I considered the other options and realized that I was either dealing with vaporware or a more expensive product whose guts looked exactly like the ARC. Things may be different now. FWIW, mine is driving Boston Pro60s.That's pretty much my needs as well. Want something, light, small and I don't care about spl either. Think I may try one or two out. Are there any other competing models from other companies that are comparable in size and weight?
I'm not familiar with the BB amps. Is this what you mean?Planet audio's BB amps are tiny
the BB2 are not as small
Their website showed this:I'm not familiar with the BB amps. Is this what you mean?