I've got to say that there is a lot of mis-information in this thread. I actually think a couple of the people previously posting are under the assumption that the TP filter REPLACES your original filter. You actually keep your original filtering and the TP filter is added parallel to your factory full flow filter to more finely filter a small amount of oil continuously.
1. Given, most factory oil filters do a good job and with the good air filtration, good oil, efficient engine designs, etc. most engines will go 200k miles these days. But what's wrong with going the extra step to filter your oil even better and extend oil life?
2. TP oil filters will not automatically void an auto warranty. The only way a warranty claim can be denied is if they can prove your TP filter was the cause of the failure. (Per the Magnuson-Moss Warranty Act.)
3. TP filter media does not come apart and clog your oil system.
4. I have to say this quote is pretty silly... "They clog up pretty fast and so you are running unfiltered oil through the by-pass system."
Actually, if your TP filter did clog up it only means you don't have the EXTRA filtering not that you have NO filtering. You still have the factory filter doing it's job.
5. Another quote. "TP filters are a relic." They are not as popular today because everyone expects a hi-tech looking package. Amsoil, Gulf Coast filters and others sell bypass filters that are spin-on or have a more modern appearance but they don't do any better at bypass filtering than a TP.
6. The only other thing that I'll comment on... better oil filtering can only keep your engine oil cleaner and extend the oils life by cleaning the contaminants from it. It doesn't affect head warpage, fuel mileage or how lucky you get with the girls. But it would be nice!
By the way, I don't know of any other TP filter companies other than Frantz (still in business) but there are a few others that sell bypass filtering kits. All are more expensive. Amsoil and Gulf Coast Filters to name a couple.