I purchased a Cub Cadet XT2 GX50 earlier this summer. I have a little more than 4 acres to manage. This includes about 3.5 acres of pasture and the rest is lawn surrounding my house. I bought this tractor because I could dual purpose it and change blades quickly. Standard blades for the pasture and mulching system for my yard. The fast attach system seemed ideal as I could jack the mower up and change blades quickly. I think there might be a design problem with the locking collars because they have become impossible to remove by hand. I have to wedge the collars up and pound the blades off with a rubber mallet. I think that debris collects inside the collar making it extremely hard to push it up to clear the dowel pins that secure the blades. I will be calling the Cub Cadet help line, but was wondering if any of the other users on the forum have experienced similar problems and what, if any, solutions there are. Overall, I'm pleased with the mower except for this. Thanks.