If you're comfortable with Mastercam, stick with it. It's more powerful than all the competition I've seen in that price range, as well as being just as powerful than most that are well OVER Mastercam's price range. Support is excellent, configurability, usability and everything that goes with it are also superb. Of course it does solids, surfacing, and obviously supports 4 and 5 axis very robustly. You have full control of toolpaths, strategies, posts, and many other features that make it hard to find a part Mastercam CANNOT make. (I've never seen a part personally that Mastercam couldn't make)
Another consideration is the very soon to be release of X. If you haven't seen X, you're going to be in for a suprise. Before you make your decision, get ahold of your dealer and have them show you X.
Matt
San Diego, Ca
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)