Not bad, but not for me Rated 3 out of 5 stars
I was interested in this add-on solely to replace the direct access to recently opened Google Docs/Drive documents that I had through a recently deprecated Gmail lab.
Having to toggle between the integration and my inbox is inconvenient (the previous lab appeared in the Gmail sidebar), and ultimately not worth the cost (the Drive integration is available only in paid versions) - I can just as easily get to Drive with a bookmark.
I can see the benefits of this add-on for those who access a variety of Google services regularly, but it doesn't seem intended for the purpose that I was interested in.
Difficult installation of Pro Trial Rated 3 out of 5 stars
After easily installing the free add-on and discovering that access to Google Drive (which is the sole reason the add-on appealed to me) was available in the Pro or Plus versions, I decided to get the free 14-day Pro Trial.
The installation was non-intuitive at best, and the web site provided no step-by-step or other information that might have been helpful.
The developer replied to an earlier (since deleted ?!?) comment I made here, which cleared up the confusion, and I was able to install the Pro Trial, which I have been using for several days.
Not sure yet if it's worth the price for my limited needs.