It's a tough call. I've had one for about five or six years now and I do still use it. I feel that there are better tools available but at the same time this prep center does a pretty good job.
The major downside to it is that the brushes that come with it are pretty much useless and they wear out fast if you use them. The most useful tools like the military crimp remover and the primer pocket uniformer are added expenses, and they are not exactly cheap. In fact if you need both tools, and one of each large and small, then your cost nearly doubles.
On the good side, the tools are very durable and after thousands of uses I still feel that there is no need to replace anything due to wear.
The chamfer tool can be used to cut away crimped primers, though it isn't great. The chamfer and deburr tools produce very nice smooth cuts with no chatter marks.
However, I normally use a different chamfer/deburr tool in a drill adaptor that does just as good a job and is much faster to use. I also the chamfer end to cut crimped primers and that is also much faster to use than the Prep Center. One of these pieces.
http://www.midwayusa.com/product/465641/rcbs-chamfer-and-deburring-tool-17-to-60-caliber
The primer pocket uniformer works well too, and can help remove crimped primers as well. It leaves a very clean primer pocket and eliminates the need for the brushes completely.
I rarely use the chamfer and deburr tools anymore, but use the primer pocket uniformer all the time. So my unit's total cost is in the $200.00 range, and that's way too high for what I use. If I had only purchased the actual tools I needed, my end cost would have been a lot lower. Because in essence, my Prep Center has become just a two hundred dollar primer pocket uniformer. And that is just stupid.
My answer to the question is no, it is not worth it.
The Prep Center seems like a good idea primarily for chamfer and deburring routines. But no matter what method you use to trim cases, you're always going to better off doing the chamfer/deburr while the case is still mounted on your drill during trimming. Once you remove the need to chamfer and deburr, the Prep Center's value is diminished greatly.