Being able to edit files from any physical location is nice. Although you already get this from just using github/bitbucket, for the most part. I think the big

Being able to edit files from any physical location is nice. Although you already get this from just using github/bitbucket, for the most part. I think the biggest drawback to an online IDE is the development box itself. Are you comfortable developing with just 256mb - 1024mb of RAM? For some web apps and low-CPU projects, this may be fine. Otherwise, you're going to lack that processing power and speed.