i have a 18 mtn cat and rented a 19 alpha for a day. I never felt that it was tippy or any easyier to ride. i liked it but i rode it just like my mtn cat and unless i had them side by side i didnt feel the difference. the alpha even had a belt drive but stock can and skis. my sled has ssi y pipe and pipe mod and a can with slp powder pros. I do think i felt like it kept more traction while doing a donut or things like that but if there were two sleds all things being equal and the twin rail was cheaper i would not hesitate to stay with the twin. I have nothing bad to say about the monorail i just have read and heard that people were tipping over and having a hard time right away and i didnt see where there was that much difference.