I personally know the owner and some of the employees at Mecsoft. They are great people. They put out a fantastic product at a price that is hard to beat. They would have gotten my business but there wasn't some very specific features I needed. I use both Rhino and SolidWorks for my business and they would even give me a crossover license for both for a couple hundred bucks more.
If it weren't for my clients insisting on SolidWorks and their market domination in my industry I would have been using AlibreCAD (now Geomagic) with Mecsoft plug in. I could have had parameterized design work with Alibre and Mecsoft, and the surfacing organic work with Rhino. (Edited to add: I could have had the full surface and mechanical WITH 4 axis for the same price as one seat of Solidworks Standard).
My current system is SolidWorks with SolidCAM. MUCHO dinero but it's the life blood of my business. The Imachining is pretty fantastic. I am still learning the SolidCAM (got it last month) and WOW. The interface and file management of SolidCAM is not intuitive but it is powerful.
One to watch out for is HSMworks. That one is by far the most intuitive and SW user friends plugin out there. Good price too.
I have no experience with GIBBS. MasterCAM has done nothing to impress me and is not at all innovative. MasterCAM nickel and dimes you to death and has been playing catch up since Version X. BobCAM gets a bad wrap. But for the price they have some fantastic capabilities. I maintain a full seat for the nesting and ART add-ons. I was a Unigraphix NX programmer for a long time. Nothing bad to say about them.
Hope this helps someone.
In the meantime I am evaluating