They're pretty common around me. They can grow to have nice, bright yellow spots if treated well with a varied diet.
It grows a foot in length. Smaller than its close relative the Pterygoplichthys gibbiceps.
Might as well! It's $5 haha.
Yeah that's worth it to me.
Your call though. In a few years he'll be a foot so remember that.
It might act territorial if there isn't a lot of space in your tank too.