Well when a question of what advice to give on maintainability came up on perl5-porters, the most common response was, "Tell them to use parentheses." In fact perlstyle also tells you not to omit unnecessary parentheses. :-)

Personally I tend to not want to worry about predeclaring functions with strict, so I use & and parens. YMMV.

My other differences from perlstyle are that I tend to use a 2-space indent to match co-workers rather than the 4-space indent in perlstyle, and I am in the habit of using redundant punctuation.