Phil,
A while back, myself and 2 buddies treated ourselves to a workout with Pat Etcheberry (fitness trainer of Courier 'years back' and currently Hennin). He was pricey. It was an extravagant purchase (over $500/hour). He ran us through a myriad of different drills. If his goal was to break us, he was successful. His drills were difficult, because we had to execute them all in an athletic stance. If we stood up, there was Pat yelling at us. It was a pretty good session. The only problem was that as soon as we got back home, Pat wasn't there to yell at us when we weren't drilling correctly.
Soon, despite our best efforts, the workouts became less intense...We didn't have a constant reminder of when we were moving correctly or incorrectly. The element that I like best about the belt, is that you always know, via the feedback of tension or lack thereof, when you are drilling properly. If you can consistently keep your workouts supremely disciplined, meaning, you can continue to execute proper technique as you begin to tire with no feedback, verbal or otherwise, than you are a better man than I.