I removed our water filter this weekend (and I am going with an external filter). The removal was simple and required only an adjustable wrench, screwdriver, and a small amount of teflon tape.
Benefits - Immediate increase in water pressure! Outside shower actually sprays now! (No. I probably won't use it as a shower, but it will allow us to wash dishes outside on occasion.)
We found a missing kitchen knife that we had received as a gift that had fallen behind the filter through a hole in the shelf. (The hole is temporarily covered.)
During the filter replacement process, I always seem to spill water inside the cabinet no matter how careful I am.
Potential problems - The removed WaterPur filter seems well made with a very durable filter. I like the clear filter chamber. Also, the filter was in surprising good shape even after using it for nearly a year.
We are no longer filtering water from the "white water" tank. I know that if I clean and sanitize the system, we should be OK (The water should be potable.). However, It was nice having the extra protection.
I am not a "filtered" water "freak". However, I am not alway's sure of the water quality as some of the campgrounds that we stay at and feel that it is better safe than sorry! I hope that I can trust the external filters.