Same, never looked back! My favourite ones are the persona (morrisons) 19p each and they last about two weeks. Since switching to double edge, i can go against the grain on my face without irritation, whereas with the triple blades, i'd get irritated in any direction!
I like Gillette 7 o'clock sharp edge (yellow). My fave. I now use it only for special occasions. I found Feathers far too aggressive.
Where do you get your blades from? When i bought the shaver two years ago i got a few packs of blades with it (derby and something i cant remember) and i still have them, only ones i bought were morisons ones, and some cheap ones from wilko, i think something stupid like 9p each, but they didnt like my face!