The STP XL anecdotes posted show it to be a well made filter, this no exception. Also it has very solid efficiency 'rating'.
On the negative side 'for me', they don't come in a 7317/14610/7356 size only the shorty 6607. For ~$10 regular price that makes them a no go. Unless part of a stellar AZ oil/filter promo combo, wouldn't use one. Haven't seen one of those at AZ that interested me. Also with the FU (spin on) $1 less regular price and preferable coo, wouldn't choose the XL first in that tier filter. My .02
Thanks for c&p.