Personally I've never had any problems with Academy decals. Aftermarket ones would probably work better but the kit ones should be ok.
I've been working on the Academy F-86 and frankly the decals so far have working fine for me. I've only put on the yellow stripes and they don't match perfectly but I've never seen any decals like this that worked all that well. I should have masked and sprayed them on but stupidly thought I'd give them a go.