On their website, they list their plans Enterprise through Community, left to right. That's the opposite of what's standard and immediately makes me wary.

They might be great, I don't know. But if something as non-standard as that is done, what other weirdness behavior does their software have?

Heh. Brace yourself; Burp is very weird.

It's worth learning though. I haven't found a better intercepting proxy, and the community edition is pretty powerful.