I too am considering buying either the commercial 48 or the z-force s 54 since they both have servicable transmissions which i have read is the way to go. I also have a large sloping hill in my front yard that is probably around 20 to 25 degrees that is why I like these cub cadet models over standard ZTR, they are supposed to hold hills better. I am also at large guy 375 lbs pounds so I think the tilt steering wheel will help keep the wheel from rubbing against me. Is it worth the extra $500.00 dollars for the commerial 48, $5,499.99 vs $4,999.99 for the force z 54. I don't really need the extra cutting area of the 54 because I and only mowing 1 1/2 to 2 1/2 acres and currently use a 42 tractor and can do it in 1hr 45 mins. I was originally looked at the z force 48 but saw it had a sealed transmission used in the cheaper s series. I also am concerned about all of the belt wear problems I have read about on these mowers, however most of these seemed to be on earlier verisons when the first came out. I wonder if the have fixed this problem my dealer said they will ware out belts quicker than my 12 year old craftsman tractor because the blades now days turn much faster, is this true or is he blowing smoke at me. I haven't actually sat or drove either one, he is out of stock and only has the cheaper rtz s series and would have to order one for me, because its the end of the year model wise for him in sales and he won't be getting any more till next years comes out, unless I want to buy one. I want to get the best mower for the least amount of money thats why I am looking at these 2 vs a John Deere x534 with 54 in cut for 6,995.00. Can any of you guys give me an idea for what I should do not a lot of choices on different mowers in my area Philpot, KY, at least the cub dealer is only 2 miles from my house. Thanks for any help you can give me.