I'm snooping around for a wheeled stump grinder to use in areas I can't use my carlton 8018 Ideally I'd like a 7015. How do the rayco rg50's rate? I'm assuming they are considerably slower than a 7015 because of the smaller motor and hydraulic drive. Are they still faster than 35 hp belt drive machine? Do they have any weaknesses or things to watch out for? Thanks.