I was looking into the micro BR, there are some good demos on the site
the thing that put me off was that for how much it cost, I would be far happier to play my guitar acoustically.
-poor battery life (apparently)
-effects aren't that good (matter of opinion)
-taking the guitar signal out of audio uploaded to it isn't 100% efficient (for jamming along)
BUT I only know this from reviews, not my opinion: but enough to put me off