Have you ever used these products?
Are these products any good?
What would you change?
I only use PVE and CodeCalc which are not compatable with Inventor but I have heard Compress is quite good.
I don't think it creates a live link between the files so if you change something in your design you would have to re-import the geometry or manually make the changes in Inventor (which probably will be difficult based on the way the geometry was created).
Ask about this with the reseller anyway, if it does keep the link the let me know.