I started riding twins just this year, although I was jibbing and hucking for many years prior (for milesb).
Twins are a fun all-mtn tool, except that they really don't compare performance wise to say a G3, Axis X Pro, etc. I used my Concepts in crud and chewed up pow, and they were great. On super hard packed, on the other hand, they leave a bit to be desired. For a young kid who likes the park more than the rest of the hill, they are great. For folks who don't take air or more specifically, have no plans on landng fakie, other skis are better. I think twins are just swell!