i'll give it a go, i just installed the frantz onto my 4runner and a gulf coast 01jr on my land cruiser. and i just won a motor guard filter off of ebay and will play around with that. i can say that i like the frantz a bit more than the gulf coast because the gulf coast has a cheesy internal devise to extract the roll, it has no screen like the frantz and the center tube dosent seal like the frantz(infact there is no seal on the center tube thingy in the 01jr) i do however like the design, and construction (still needs alittle fine tuning) of the 01jr (the clamp is awsome). maybe if someone would combine the 2 or three designs we might have something to write home about, i did notice today on a instuction manual that i got from Ralph when i ordered my 01jr, it showed the flow of the motor guard filters to be opposite of the frantz(typo maybe) but then again i look at all of the restrictor holes that are incorporated into each design and they are all in the return side of the units, kinda odd considering that you dont want the full pressure inside of the unit but rather just what is needed to do the job(leaking potential). the o1jr is suposed to be rated at 75psi and i dont know what the frantz is (asked the owner but she didnt know either)
the motor guard is made of cast aluminum, not really one of my favorite metals. so thats why i opted for the others. but i can see how it would be superior in its filtering (kinda crimping both ends of the roll to form a better seal around the canister), now if some one would take the design of the motor guard make it with the fiberous nylon like the 01jr and putting stainless or of the like, bungs for the fluid it would be an outstanding over engineered something i would love to try to sell to the public, right now at work i talk up the frantz
hope this helps a little