The only problem i have with my finger technique and the one finger per fret rule is, i'm not smooth returning on Notes, so the whole 1,2,3,4 is fine, but when returning back 4,3,2,1 i find my third finger still isn't developed enough going backwards on runs at any speed over 90bpm and it really slows me down, its quite frustrating! But still practice makes perfect and its something to work!
And i totally agree with both of Bilbo's posts! very relevant!