I hate to be the dissenting voice here but I guess people will always have a different experience when doing the same thing.
I also bought the 25 grab bag, and yes, shipping was fast, pins were in excellent condition, no doubles. BUT, I got 11 ProPins in my lot! I did read on the site that there would be some but did not expect it to be such a high percentage. I thought I might get 2 or 3. I won't buy from them again. Now I have all these pins that I can't take to the parks. Like I told someone else, I guess I'll give them out for Halloween. Very disappointed, but I have no one but myself to blame.
If I were you, I'd get a lot from ebay and be sure the seller tells you in the description that there will be no ProPins or Sedesmas.