i have the machine 57 im 62 175 with 12s for flippers i also had a riff last year. in whistler the riff delaminated and the nose broke in under 3 weeks of riding it! huge dissapointment cuz it rode so great. no idea if theyve fixed the problem this year but for warrantee instead of getting a new riff they sent me a machine with 390s. i got the 57 and it was maybe a lil softer but not super noticeable. ive found its not good for rippin it fast into the big cheese wedges but pretty good in the park. i have a ride dh2 as well so i use my machine for park days and dh2 for the big jumps and big mtn days.
I definatley loved the riff before it exploded but if they have fixed the problems with the riff its definatly better for all around. If ur just doin park or jibs the machine is cheaper and does the job. dont detune ur edges tho cuz riding hard pack with it or holding an edge into a jump is super hairy