[bigpooch]

This is pretty much dead on. I've only broken a pat boat
with either aces full or KKKAA and only against one or two
opponents that have drawn three. Not all was rosy though:
the one time I lost was funny: I limped from the cutoff with
pat aces full and was heads up with the BB. He drew three,
so naturally I broke and drew one to AAAx and did not
improve. The BB bet out and 3-bet my raise and I called to
see that he made a straight! [I'll still break aces full or
KKKAA heads up against a three card draw.]

In PL/NL, I would not think of breaking a pat hand since
some players might think you are bluffing. Also, anytime
anyone draws less than three cards, you are in some jeopardy
of losing, especially against one card draws. If there are
any one card draws or two card draws against you, it's
better to hope they make a second best hand and lose more
chips to you.