No 3rd party. I sent them pictures, wasn't trying to overvalue the car, and I suppose I could (knock on wood that I would ever need to) get a replacement for close to a "wash". I asked for agreed value a bit less than $20K which saves a little premium money, though originally I was going to set it higher. In fact they had sent me a quote at one point and were prepared to offer the policy for more agreed value.
Throughout the process, I spoke to them over the phone, made contact via fax and email, and it was a very pleasant, easy experience.
I'm careful on the road, a person doesn't need to drive the hell out of these cars, beat them to death, or be reckless to enjoy them IMO. I get a kick out of seeing it just sitting still! In fact, lots of other folks out on the road or wherever enjoy seeing it, too. It never fails to get compliments and such....that's certainly agreed value, too!