Look at the ASV RC50. Much better machine. Even though I have had far too many problems with my RC30, I seem to be in the minority.
I don't know how much they are in the States. But I have to allow app $8 per hour for the maintenance of the track system. I believe that this outways the advantages of the extra work that can be done with these machines. IE, Muddy ground, sand, steeper sites, snow etc.
The web ddress is
www.asvi.com