if you havn't decided already, here are my two cents as i have both...
They both do not work with Ipads unless you down grade the firmware to almost a year ago (forgot version name, i got an ipad with no apps just for note taking purposes, but even then it doesn't work well, as the keyboard does not respond after a bit of use 4-10 minutes max)
As for the difference between type S and normal. At first they feel very similar (like when you first switch from RD/Scissors to topre, but after a while you can't live without them), but later you first notice the travel is slightly lowered with the type S, which of course is a bad thing, but i tend to bottom out less hard (doubt people actually don't bottom out with topre unlike cherries) with the type S, because it feels more linear.
Also another point i note (as a lot of other users have also noted), topre keys have a fairly large variance between the force required to depress a key even within the same keyboard. However, my type S seems considerably more uniform than my normal keyboard, this could be due to luck of course.
The noise reduced is very noticeable, especially if you type at any speed above 70.
Right now i prefer the normal keyboard over the type s purely from a typing perspective, even if the keys are less uniform, i find that I type slightly more accurate as the tactile feed back is slightly stronger, this view is formed after using both boards since type S first came out, at first the novelty had me all over the type S, and I still feel that it "feels" better (as it is more linear, and therefore less impact on my finger tips) but there is an noticeable increase in accuracy and speed (ie, barely, very very very very little) when i switch over to the normal hhkb.
