Some, and I say again some pilots in my company seem to think they can invent their own performance shedule. 2 things I hate: "we are VMC so don't worry about climb performance" I mean hello, am I missing something here? Do clouds have some sort of braking effect on aircraft? The only difference in VMC is that you will see the mountain you're flying into!
and: "I know performance tells us to accel at 1500 feet but we'll accelerate at eeeem, now lets see (guess guess guess) oh, 400 feet." So in other words we don't have a clue if we'll avoid obstacles or not but "I've been doing this for 25 years and nothing ever happened to me." Sorry to react so strongly, but I think it is something grossly unproffessional. Nobody 's perfect!