Never tried one myself, however I was on a ride a few months ago when someone punctured and tried to use one of these new fangled things, all sorts of problems, he then tried with my three traditional old school plastic levers, the tyre was off in seconds, he threw the thing in the bin when he got home. This was a mountain bike tyre, not sure of how it would work on a road bike. Normal tyre levers are so simple, work so well and are very cheap, I can't see the reason to change.