ordered yesterday from ajpurdy arrived this morning.
AJPurdy seems to be the dealer of choice for PH'ers at the moment. They had a kidney off me last week, thanks to Mad Dave mentioning they had my camera in stock.
there is movement of air when you move the barrel but thats only going to blow dust around thats already in the chamber. I think the main problem is that you generate more force with the push pull. my sensor gets lots of dust any way so not really going to see a difference lol