Haven't actually tried the PSX AC circuit protectors, but they do seem like a great product based on forum comments like above from those who know of what they speak. That being said, I decided to go a different, less expensive route, that by all accounts seems to offer comparable protection at a fraction of the price. I'm talking about Airpax Instant Hydraulic-Magnetic Breakers paired with TVS Diodes. One set of each is about $15 - 20 plus shipping.
They work equally well in conventional and command operations. These breakers trip within 0.1 seconds of overload, have a visual trip indicator, and manual reset.
Here's a link to a recent topic about these Breakers: Airpax Snapac Hydraulic-Magnetic Circuit Breaker
If anyone has done any side by side comparisons between the PSX-AC and the Airpax Instant breakers, I'd really like to know more about your observations.