I have an RCBS Pro-trim, converted to a II case holder, and powered with a $10 black & decker power screw driver. I just picked up a Franford Arsenal Platinum case prep center, and assuming it holds up, I'm VERY happy with it. I've used the Lee handheld, press mounted trim dies, and drill-press powered LCGW WFT's, but since I shoot a lot of straightwall stuff, I'll always have to have something capable of trimming them, and for me, that adds up to a shoulder based like the Giraud/FA Platinum plus a lathe type like the Pro-Trim II.
Wanting to upgrade to a 21st century to incorporate a better neck turning system than RCBS's, but I don't turn enough to justify the cost.