There are many definitions for what exactly a power-user is. ​ resumed power-user qualities in an older post:

A good power user digs around and looks for other ways to do things, does research and talks to other people about how they are doing it, possibly building the same part in many different ways - just to see what works and what doesn't.
A good power user can look back at some of their older work, and laugh about how they once modeled something - before they knew that great "trick", or before their enhancement request was implemented. (the lucky ones can "re-discover" a forgotten method, and impress themselves by their own creativity.)
A good power user isn't afraid to say "What if?" - then do a "save as", see if they can break it, and maybe try it again a different way.
A good power user isn't afraid to say "I don't know" - a really good one will go on a "quest" for the answer, and not be happy until they find it.
A good power user knows that you can learn something from ANYONE - It could be someone coming back from an Essentials class, or a seasoned veteran - It may not always be the "right" way, but a good power user knows that learning something the "wrong" way can also be valuable.
The best power users really, really want to share what they have learned with those around them - "Hey, I just found out that you can do this . . . Check it out!" - The really, really good ones can inspire others to be the same way - then when you bring an idea, they can add to it, and improve upon it, to make that little "trick" even better.

Dave, your peers in the SOLIDWORKS Community recognized you as a SOLIDWORKS Power User long before deciding to award you a formal Certificate.

It is our pleasure to put all of these in writing, in an official certificate of recognition (see attached file also):

Once we have your mailing address, you will receive the original hard-copy.

Update: The signatures kept coming, so the certificate got enlarged to "B"-size. ​ contributed with a new artwork, his masterpiece The Colors Of Musical Strings.