Generally speaking, people that don't like the ICS/EST system fall into two categories:
1) They don't trust the two bolt mounting system
2) They think there is no benefit and is strictly a proprietary invention by Burton to force people to buy their bindings too
Personally speaking, I rather like the ICS/EST combo. I haven't had any issues out of all the ones I demoed (about half of their 2011 lineup and several bindings). I can't really explain it, but the flex of the board feels smoother when you are using this combo. However, it is not enough to be the purchase reason for me. The biggest benefit in my eyes is the dampening. There is no plastic between your feet and the board which equals comfort and dampness. The ease of setup is also a plus, but in all honestly isn't much quicker. However, the stance options are infinite as you can dial it down to less than 1 degree rather than the traditional three degree increments. Same goes for stance width and positioning.
The only reason that I didn't get a Burton board this year is because my personal dislike towards their bindings. I just like other bindings much better for the price ie. Rome 390 Boss. And I just didn't feel like buying an ICS board if I knew I wasn't going to use EST bindings. The board I was considering just wasn't good enough for me to forgo the bosses for EST bindings.
Could be a different case for other people though. The Process is a good little board for the price. However, I honestly do feel like the Rider's Choice will be a better board for you especially in icey conditions.