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VD.I'm not certain as to whether there are rollers or not in the toe pieces of the newest STH pieces, in the old ones there aren't. The Dynafit toe attachments do have the potential to effect how your boots react with said rollers. In reality however, this is a negligible loss. Moreover, I presume you're asking about downhill performance, in which case the presence of the Dynafit toe attachments are irrelevant. It is however worth remembering, that such alterations would affect the warranty on both your boots and bindings.
I would at this point urge you to reconsider the SI&I system, it is not a true tech set up. Regardless of where the weight is during uphill travel, on your ski (in the case of a frame binding) or in your backpack (in the case of SI&I), it is still extra weight.
gapersarefriendsi just googled and did some research on the SI&I system, that looks so sick and im pretty sure im gonna go that route. do you have any time on it?
VD.I haven't personally, but I tour with a guy who has a pair and he's pretty complimentary. He's never had any issues with the set up so far and he's been on it a season. The rail does get iced up, but this is something you'll encounter on frame bindings too and one has a similar problem -although different the toe gets clogged up with snow- on beasts.
JaybrtnI picked up a pair of k2 pinnacle 130s which come with tech inserts already. works great with the cast system. But I dont think they will affect performance at all, could be wrong though.
The only issue I have with the cast system is the icing, but you just have to scrape it out and you're good to go. I use the system for resort/park days then when I want to hit some bc I can. makes my life easier