Your favorite altitude

EridanMan writes:

About the only exception i'll say in terms of other 'altitude
preference'. When flying heavily congested, open vfr airspace (such
as SF bay on a bay tour), I've always been most comfortable flying at
'250 and '750 altitudes rather than '000 and '500... The rational is
pretty simple - its still trivially easy to track my altitude
precisely (the mind responds faster to vertical or horizontial
orientations on the altimeter than it does reading particular values),
while at the same time, it gets me 'off the beaten path' so to speak.

Do you risk getting into any trouble by not following the x500 rule for
altitude?

Wouldn't it be safer to fly at x200 or x700 altitudes, since the transponder
rounds off to the nearest hundred?

Unusual altitudes appear to violate 91.159 unless you're at 3000 AGL or below,
although I thought I had read somewhere that VFR flights could fly at any
altitude as long as they were not directed otherwise by ATC.

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