Although as has already been discussed, it's not clear that the efficiency rating (at least for these filters) has any bearing on actual engine longevity. And you don't know that the 50% rating is due to leaking glue pleats, in fact that isn't shown at all.
Mind you I don't use OEM Toyota filters either, but I have no real reason for not doing so.
Originally Posted By: ZeeOSix
After seeing how bad the efficiency of the Toyota filters are (50% @ 20 microns), I'm thinking some of the reason for that bad efficiency might be some leaking at the ends of the pleats. When you have to glue over a 100 pleat ends, the chances of having a bad seal or two could be possible.