just finished the Recettear demo. it's about 2 hours long and saves are compatible with the full game, so if you're interested, give it a shot.
it's okay. it's a no-budget indie game, but a polished and cute one. my bigger issue is that buying and selling isn't that fun (it's just higher/lower numbers until everyone meets in the middle) and the dungeon gameplay is kind of naff. it also has the uniquely Japanese problem of assuming you only play PC games with a gamepad.
it is kind of interesting that your adventurer equipment is also your store equipment, so you have to weigh selling that powerful longsword for a phatty profit vs. selling it for far less to an adventurer (but then getting to use it in the dugneon).
I had fun, but I don't really feel the need to spend $20 and 20-30 more hours on the full game.