Fwiw, we stock OEM Toyota, aftermarket, Marlin and Trail Gear inner axle seals for the 7x/8x/10x (and earlier models). We're happy selling customers whatever they like to use but are happy to share our experiences too. The Marlin seals are great, we've sold and installed tens of thousands of their HD seals for inner axles and pinions since they first hit the market in the late 2000's?. Marlin was a friend and we've stocked their products for decades. BUT, experience has shown they are not preferred for full-time 4WD 80's, particularly when any seal surface issues (grooves) exist. Fwiw, I don't know that anyone would argue the circlip is preferred to a spring, the opposite imo. Obviously your results vary, that's great, a dry axle is a good axle.