This is a TREMENDOUS add-on, which will save you time & effort!
I love the flexibility in choosing how to install an add-on, and the built-in version checker for all your add-ons! That feature in itself, saves you a lot of time in running down what version you have installed vs. what is the latest version that's available.
The only issues I encountered in using it, were: 1)attempting to Upgrade other add-ons which were marked as 'Download Now via External Site,' in which case it could not resolve the ZIP file and threw several errors and, 2)some add-ons (i.e. those w/o an 'upload' directory) would get written to the server in the wrong directories. So if you see some new stray/duplicate directories on your server that just don't seem to belong there…they probably don't.
Again one other thing, that makes this such a handy add-on, is the ability to check the versions of all your various add-ons. That feature alone, makes this a desirable add-on in that it helps you to keep your add-ons up to date!
