Dynamic Cruise Control Surprise

So today, I took my brand new 2010 Prius V to my local Toyota Service Center for what I thought was a problem with my Dynamic Cruise Control. After I set the speed, if I hold the lever up to increase the speed, my Prius accelerates madly to very high speeds. Conversely if I hold the lever down to slow down, my Prius brakes very quickly.

After a few minutes, the service manager came out and told me that he could find no problems with the DCC and asked if we could go for a ride to show him the problem.

We got on the highway and I set the DCC for 62 as I usually do and then held the lever up to increase my speed. Sure enough, my Prius accelerated wildly. It was then that the service manager told me that when the lever is held in the up position, the cruise control setting in the DCC window is what is affected, NOT the speedometer. It turns out that when the lever is held up, only the cruise control setting is increased, and it increases very quickly, very much faster than the speedometer can follow. So, in actuality, I was holding up the lever and watching the speedometer (like I have done with every car I have ever owned with cruise control), not the speed in the DCC window. The speed indicator in the DCC window went very quickly to 80 MPH so the car accelerated as fast as it could to get to that speed.

In my opinion, this is a very bad feature. The DCC should either increase the speed indication more slowly or, even better, be locked to the speedometer so they increase together. Sure, I can tick up the speed by pushing up the lever one tick at a time to get from say 62-72 MPH, but the speed indication jumps much too quickly if you hold the lever in the up position.

Has anyone else shared my experience?