I had the Hydroboost in my old Chevy diesel truck. For the most part they worked ok, but there were a few things about them that I didn't care for. First, hard braking like making an emergency 30-0 stop could be hairy, sometimes it didn't want to stop hard. Could have been my system was a little worn out after 350,000 miles and this isn't a common problem. Second, on a cold (30*F or less) morning before the PS fluid gets good and warmed up the brakes are VERY touchy. I mean it, don't even look at the pedal very hard. The slightest touch gets you an introduction to the windshield. For the most part the system worked pretty well but I would have preferred a vacuum system. If your cam is not producing good vacuum at idle you could always run a vacuum reservoir like racers use. They work quite well, storing higher rpm vacuum for later use. Besides, don't you just love the term "vacuum reservoir" having one of them under the hood gives you an excuse to drop it into conversation. The concept of needing to have a container to store "nothing" in abundant supply sounds ridiculous, but it beats not stopping.
"My other car is a BULLDOZER"