i want to know as much as i can about these sleds. im seriously thinkin about buying one. the sled i want has a 500 motor with ves. how much extra power do you get with the ves compared to a 500 motor w/o ves? how fast do these sleds go? are they a arm stretchers? how would this sled compare with a 600? could you tell me more about ur sled xc sp 500 rider? im also looking at a 600, but idk if it has ves