I'm very happy with the sniper I use. It has failed to let me down yet.
In fact I recently snipped a car on ebay at 13K when the Glass's trade was nearer £16k and subsequently sold it within a week for 17K
When I sent my driver to pick it up the seller commented on how I managed to get a bid within 3 seconds left and hoped I never turned up as he had other bidders emailing to buy the car at much more than I bid!
This is not always the case with sniper programs but it has served me very well in the past.
If anyone wants to know what I use PM me. It's not free per snipe but their charge is very small (about 25p a go I think).