I have the Pro-Pack II, and I love it. As previously mentioned, there is a bit of a learning curve, and the angle cube is a good investment. If you are going to be reprofiling super steels, the extra-heavy grit diamonds would be a real time saver; I have down to 100, and reprofiling my 0600's B75P seemed to take quite a while. I think the lower one is 50/80 grit. The superfine ceramics are on my want list as well. I do like being able to pick a price point at which to jump in, and then add on as I need or want. By the way, the case that WE offers is a bit pricey, but works very well.