I wouldn't use Mega because of their reputation. I'm being biased and probably a little unfair but I would feel more comfortable telling my users to allow Dropb

I wouldn't use Mega because of their reputation. I'm being biased and probably a little unfair but I would feel more comfortable telling my users to allow Dropbox/Google Drive for my app as opposed to Kim Dotcom's Mega. Reputation isn't everything, but it's still important.