|User since||August 20, 2007|
|Number of add-ons developed||0 add-ons|
|Average rating of developer's add-ons||Not yet rated|
Gives Power to the People Rated 4 out of 5 stars
There are some issues with script security and deployment/versioning that you should be aware of, but otherwise its thumbs up.
I wrote a series of blogs on Greasemonkey:
that covers my thoughts in much more detail (pardon the self promotion).