Just picked it up.
Looks pretty cool, I like the simplified Transform. I wish Unity had a way to just allow you to have default editor extensions in place so you don't have to import them for every project.
Thanks! We're glad you like it! Having U2DEX be auto-imported on new projects would be great -- maybe Unity will get something like that in the future.
As far as I can see, the three things you get are:
Modified Transform Panel in Inspector
Grid Tool
Snapping Tool for Grid Tool
Are these just UI changes, does it affect final build in anyway?
Are you adding any other features?
Correct, you get the three things you mentioned (although the Transform Inspector has multiple things going for it, like the rotation, scale and layer filter). There's also the Applicable Classes that allow you to apply the Transform Inspector to any named class. (Like the Unity Camera) Also, don't forget that the Snap tool can be used without the Grid tool, and vice versa. They just work best in tandem, but it's not mandatory to use both at the same time.
At its core, this is an Editor Extension, so nothing will currently affect the actual game's build or anything like that.
We've got some ideas for future versions, and a list of things we'd like to add, but we're not sure if/when features will be added. We'll keep everyone updated as we finalize features and such, so don't worry about being left out of the loop.
Thanks for supporting U2DEX! Let us know if you've got any other questions/comments/ideas!