I had a set of Rocket Wheels about 2 years ago. They are built solid. The platform stays directly behind the mower. The wheels are casters. I only used it about 5 hours. I bought a second Gr***hopper and didn't use my walkbehind any more. I paid around $300 for it. My local dealer sold them for me at an amazing $275.
I've had a Bullrider for about a month. I really like it. It's built solid. I use it on my 48" hydro. It cost $367 shipped to my door. It weighes about 56 lbs. On hills and slopes I just step off and walk along side of it. I also step off when backing up. I'ts just easier that way. All in all I really like it.It sure beats all that walking on my commerical properties. It can be set in a fixed position or in trailering mode. I leave it in the fixed position, so I stay right behind the mower at all times. I would reccomend it. I don't know how it would compare to the proslide?
I just bought a 54 inch hustler wb and put the bull rider on it and it is awsome. I don't have any trouble backing up at all. I leave it in the fixed position all the time. The tires do tear up the turf a little bit.