I used a Dosko once and never again, and I've used a Vermeer 252 a couple times and it's OK. I have an old tow behind Vermeer 630A and I really like it. I think the cutter wheel is the same as the 252 but seems to have more power and cuts better. It's definately not as easy to get around, but I can get it in some tight places. It will fit through a 36" gate. I put a $69 Harbour Freight electric winch on the back of it and can winch it most anywhere, and I can tow it with my JD lawn tractor.
Sorry for not answering your dirrect question, but the 630A's can often be found quite cheap, and with practice, can do a lot of big and little work, Joe.