Hey seyo!
Defenitely, I think it's worth every penny
I have used it for about 140 hours and have gained at least 0.5 cm in length with only the PM as my routine. I will measure again when I'm up to 200 hours, but I'm relatively sure I have gained some more. Though know that it takes both time and effort to wear this thing, it's not like the 30 min newbie routine
As far as correcting the curve, I have seen no improvement so far. And as you can see in my progress post I have quite severe curve to the left.
And if I have understood it right, if you have LOT at 12 o clock then you should wear the PM downwards and/or straight out. I wear it at about 8 o clock.
All in all, the PM or some similar device is probabilly a must in any PEs arsenal.
Good luck seyo!