Dougie
Hacker
I think you gotta suck it and see.
No matter what the cynics say, for some people they work.
Ok so we don't know why, but that isn't important. Ok for many they don't work, but that's not important either.
If they're good for you, go for it.
That's pretty much the way I'm thinking at the moment.
For less than £20, if it works - great, if not then it's no big deal.