Looks like I'll be trying them sooner than I thought. The etyres mobile fitter that came to see me yesterday with a lovely new pair of expensive pirellis couldn't remove one of my locking wheel nuts as the mating shape (if you know what I mean) has become damaged. Not the key but the nut itself.
As its one of these high security nuts with a rotating collar the old trick of jamming on a suitably sized socket wont work, and they don't carry specialist tools.
Anyway, after a lot of swearing and interweb surfing I found another mobile fitter in the area that does carry the tool, and the 'budget' tyres. Guess who's getting the job!
They arnt as cheep as some people have quoted on here, but almost exactly half the price of the pzero's. Two for the price of one is a big bonus for me and almost makes up for the initial annoyance of the duff wheel nut.
Not counting any chickens until the wheel is finally off mind you.
Feel a bit sorry for etyres, not their fault and they have always been very helpful. Perhaps there's a lesson here somwhere. I think the special tool only costs £150-£200 and is largely reusable. Got to be worth investing in if removing wheels is your business.