Let me share with you my awful experience with Pit stop. I had a puncture last saturday with a very small shard of a broken bottle. the puncture is about 2.5mm and after following the instructions to the letter...it did not fix my puncture. Maybe it works in smaller punctures but for me its just not good enough to risk it as you can't predict what type of puncture you will get.
Thats just my experience with it. Hope I am the only one.