Since it’s a fork of Organic Maps, I don’t think there should be any degradation of features or functionality. I haven’t had a chance to compare them myself, but based on other accounts it sounds like it’s currently basically just Organic Maps but developed by the more trustworthy community contributors, including one of the Organic Maps founders I believe. It will diverge more from Organic Maps as development continues, but it’s starting with more or less the same app.
Unlike a browser, there shouldn’t be any major security concerns. That’s not to say there shouldn’t be any waiting period, only that I think it’d be safe to get away with a much shorter waiting period than if we were recommending a browser or OS.