I have the spring loaded handle with the "U" shaped holders. They are caliber specific yet I don't think they hold things in perfect alignment. I e-mailed rcbs about the scratches...mainly with my 30 cal pilot and they responded that it was common and wouldn't affect accuracy.
Re the lee: Chucking the brass is a virtual tie with the rcbs. I actually think I can gain on the rcbs as I can use more pressure by hand to hold the cutter to the brass where the trim pro works on a spring and takes a second or two longer. MY drill spins just a tad faster than the rcbs so it picks up a bit of time there too. Plus with the lee I have absolutely no set up time from caliber to caliber as the length gauges are always set perfectly. And with the lee the brass is still "in the chuck" when I hit it with my chamferers. The outside chamferer on the rcbs trimmate does a crappy job...my handheld rcbs chamferer does better.
Honestly....I think I can match the rcbs unit in time per casing with the lee...unless of course I had a 3 way cutter for all calibers. Imagine this only with drill power....
YouTube - Lee Zip Trim and Case Prep. Demonstration