I am.  I got the 5d3 the week it came out.  I believe Preston is as well.  Over-all, I think it is a great camera...and the prices have finally begun to fall where they belong.  They can be found for well under the 3500 map price now.
The lens I use most is my Canon 28-70 f2.8l.  I bought it years ago (obviously).  Still razor sharp and fast.
James
Ps i have a friend w a 60d and have used it before on a few occasions.  It is very nice and feels very similar to my 40d.