I never trim any of my pistol brass, regardless if it's for a revolver, or an auto pistol that head spaces on the mouth. I've found most pistol brass will split at the case neck before it ever "needs" trimming. Bottleneck rifle brass is a whole different story. I have this Lyman manual model, which is quite similar to the Hornady model you are considering.
http://www.midwayusa.com/viewproduct/?productnumber=795961About all I can say is that it works. It is pitifully slow to do any kind of volume trimming with. I only use it for small amounts of expensive Magnum brass like for my Weatherby's and .416 Rigby's and the like. For high volume trimming I bought a Giraud Power Case Trimmer.
http://www.youtube.com/watch?v=SGYLmHvKVd0It was the best money I've ever spent! It works like an electric pencil sharpener. I trimmed 2,350 .223 cases in under 3 hours start to finish. The nice part is in addition to the machine trimming to length, it also chamfers the inside, as well as the outside of the case mouth. Most all other trimmers require the burrs to be cleaned up in yet another operation. This gets very time consuming if you're working with a large load of brass.
http://www.giraudtool.com/prod02.htmThey're not cheap, but when you consider the time you save, all of a sudden they are not that expensive. Most of the other units don't have a high enough horsepower of a motor. They get around this by gearing it down to increase torque. This makes them pitifully slow, and creates large burrs at the case mouth because brass is a non ferrous metal that requires a high surface speed to cut it clean. About the only other unit I would take a look at is the new case prep center from Hornady.
http://www.midwayusa.com/viewproduct/?productnumber=314017It's a bit less than the Giraud, but it does everything. It all depends on how much you shoot. With close to a dozen rifles in .223 / 5.56 MM I keep the Giraud quite busy. I left out one very important feature of the Giraud.
My wife can run it! This reduces my case trimming time to zero! Bill T.