It's another piece of shit made by Ray. It's about $50 dollars in parts depending on how much that enclosure cost him. It's a craptacular, derivative design. It sounds like crap compared to almost all commercial non-portable amplifiers, a number of commercial portable amplifiers, and any DIY amplifier, portable or non, near its price.
SR-71 is respectable.
As for the Aria, it's okay. I'll actually put it at just mediocre. Thin, dry, bright, somewhat shrill, lifeless, etc. Still respectable however. It's Meier. That is what is expected.