I use a micro switch based version with their Pump. It's amazing the kind of water that little pump can move, but it is noisy. The peristaltic pump is another piece of over built equipment from them, very nice piece.
I may have to look into that pressure switch if it works that well. The micro switches have been working fine, but I use two staggered as a mechanical failsafe and run time limits on the Apex for electronic failsafes, their version is much simpler.
Thanks for the review, the guys there are great to deal with also.