Regarding cruising at highway speeds, i can't tell as i now need to change the speedomoter drive as its reading way out. First impressions are positive, though
you'll be fine at 55-60. its when your getting passed by every soccer mom in minivans that you'll want to step up the speed some. thats when it sucks. spinning at 3800-4000 sucks.
again it all depends on what you really want to do with the car. i want to get on the highway and cruise and 3.91's were horrible for that without OD. now with the 2.94 gears its awesome for what i want and i will probably never take those gears out unless i do an OD unit down the road.