Excellent questions! First, the Leshiy 2 is super cool (I own two, one in .22 and one in .25, both purchased early in the Leshiy 2 lifecycle). That said, you're absolutely right - it's hard to find out what all those options / version mean. I *think* the REPR means that it has an adjustable regulator that was a late addition that I do not have. The other versions are mostly changes in stock, forearm, suppressor, and bbl length. My Leshiy's are stock factory guns, with the factory suppressor which is adequate for my needs. My .25 shorty barks a bit and my .22 is quite a bit quieter. Neither disturb the neighbors but both frighten off all the surrounding critters, at least for a few minutes.
Both are compact (assuming you don't attach a 6-250x scope with a 150mm objective) and especially so for transport, where you can fold the stock.
I get a good three mags (18 shots) from the "aluminum tube" (stock) which I find more than adequate. YMMV, depending on tune, etc, but it's enough for a good hunting session.
Cons: the damn Huben owners just won't shut up! ;-), they're expensive, magazines are stupid expensive. (That said, I rarely change mags. I usually just load the installed mag "in situ".) There's no .50 version...
Pro: they're as fun as they come. They seem pretty robust. Mine have been bullet proof, but I see some issues reported here and there online - make of that what you will.
The trigger is - well, it's what it is. I don't mind it, but some do. There's a hiss if you're exercising a slow pull, but it breaks cleanly and it's not heavy. I think it's fine. I have years of competing with various powder burners, with varied triggers, and I really think it's a matter of "can you pull a trigger?" or not. If you can, the L2 isn't going to be a problem for you.
All that said, I haven't tried the Huben (which I consider the direct competition), so it may be that I don't know what I don't know...
GsT