Belles preamplifiers -- experiences at different levels?

I'm investigating preamplifiers by Belles. There has been some helpful discussion about this on the forum, but I'm curious to hear from anyone who has tried more than one Belles preamp. The current one is the Aria preamp and there is an older, more bespoke one, the LA-01.

I have not seen pictures of the internals on these guys, so those would be welcome, too.