Nice score, but that's not an original kettle, it has a plastic handle and gauge in the hood.
The older original ones were built much better. These are pretty flimsy, the edges of the lid get easily dented and the paint chips off in those cases in my experience. Also the grills are pretty cheap nowadays, but fortunately they are readily available. The vent/handle is much flimsier on these new kettles also. In general I would say these don't represent the reason I have used Webers over the years.
I wish I could justify a Summit, but given the great value in the kettle, even the newer ones, I don't see spending what they sell for new.
I recently saw an 18.5" WSM at Home Depot, $400.
Still a great score! I've entertained pretty large groups with a 22.5" kettle. Getting one for free is a gift, but the key is if you use it. Even if you buy a Summit, if you use it the cost is easily justified. Everyone should have a kettle, so if you don't have at least one, it's an awesome score for free. My daughter uses my kettle with hardwood lump using a chimney, which is exactly how I use it.
You getting it dirty again yet, or 'ya still polishing that lid? *gd&r*
EDIT: After that long reply I see your sig now, you have more than enough kettles. The one thing I like is using a chimney with the small propane canister on the performer. I still use newspaper in the chimney, just use the starter to light the paper. You should find someone without a kettle to give it to. I've given several away that I've acquired along the road...2 x 18.5" kettles and a 14.5" Smokey Joe. My daughter started out using the Smokey Joe. I started her on the small one...and worked her up...LOL She has used the WSM, but it's too much for her to setup, if I set it up for her she can tend it, but if I set it up, I'm gonna tend it.

I still use a Smokey Joe if I want to do fish and other meat at the same time. I'm ok with chicken/pork/beef, but don't like to mix fish, so either do fish only, or use the Performer and the Smokey Joe at the same time.