I have switched over to Amsoil's new EaO line of filters, due to their specs. Yes they are costly (although you can easily save around $4/filter if you sign up as a Amsoil "preferred customer"), but they also appear to be one of the best "full flow" oil filters on the market (rated for both fine filtration, and reasonably long life)!
NOTE:
In my case, I already had OilGuard bypass units on our cars, at the time Amsoil's EaO "full flow" filters came out. So I left the bypass systems on, and just "upgraded" the filtration (even more) with the better full flow filters. This combo should (at least in theory, I haven't yet verified this with oil analysis) give some of the best oil filtration that you can "easily" get in a car, with the EaO filters getting most of the 15+ micron junk, and the bypass picking up the smaller junk that remains.
And the really nice thing about such a (combo) setup, is that either filter could (in theory) handle the entire load, if that ever becomes necessary. Because if you do happen to goof, and go past the time that one of the filters plugs up, than the other filter (be it the EaO full flow, or the bypass filter) will continue filtering the oil for you. If the EaO filter plugs, it will just stop filtering, and go into bypass. But in that case, the "bypass filter" will continue to clean the oil, and things will continue to work. Conversely, if the bypass unit plugs up, it will just stop bypass flow, acting like the bypass unit was not plumbed into the system. But that still allows the EaO "full flow" filter to do its job normally. Only when both filters get plugged, would you lose oil filtration. When only one filter plugs, the oil system should just automatically "downgrade" to a single filter setup. So not only does this arrangement provide for good oil filtration when both filters are working, it also gives you built-in "redundancy" against problems when one or the other filter gets plugged for any reason!
BTW:
I wouldn't recommend OilGuard bypass units, for anyone looking for a bypass filter (for example, to combine with an EaO full flow filter). Yes, they work very well, but (as reported in the bypass forum) OilGuard has recently started "price gouging" their customers. So if you want to use a bypass unit, and you haven't already invested in a OilGuard, you would probably find one of the other bypass choices to be more cost effective...