I have a 07-600 RMK and a 08-700 RMK both 155", I really like both sleds. I am 5'7" and I like the polaris seat height and width. I did buy a skinz grippy seat to replace the stock seat cover on the 08 as it was really slick in the powder. I my experiance the polaris handles really well on the trails and in the back country, a couple of freinds have cats M series and if we have a long trail ride to the powder and back it really wears on them if the trails are like a race course. I love my 700 RMK it has been reliable and I have stepped up my ridding since I bought it. My daughter rides the 600 RMK she is 20 and rode an 06 600 RMK 144" that sled was more of a challenge as it was nose heavy with the rider select on it. She really loves the 07 600 even with the longer track but we boondock more than trail ride so the track length is helpful. I can't say enough good things about these two sleds, but lots of gals have the same opinion about Cats or Ski Doos! Happy Hunting!