It looks pretty reasonable from a capability perspective. Nonetheless, MCP3 is probably where the Prime series will regain almost all of the functionality and features of M11/M15

TTFN
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My company has upgraded our licences to Mathcad Prime 2.0 (which comes with a copy of Mathcad 15).

All of our team have looked at Prime 2.0, and while, we like the new interface, virtually all of us (if not all) are still using 15. Many of our existing worksheets simply would not transfer across to Mathcad Prime 2.0, due to missing or incompatible key functionality. In some cases, a complete re-write _MIGHT_ make it possible to re-do the calculation using Prime 2.0, but what is the point of spending all that effort with no guarantee of success, just to get a bit more "eye candy"? We have better things to do with our time and money, and Prime 2.0 is simply not yet capable of doing what most of us NEED it to do - I'll take another look when Prime 3.0 comes out - or maybe 4.0, or ...

Your needs may be different - especially if your existing worksheets are relatively simple, or if you are a new user with no legacy worksheets to port across. Why not try the free trial and decide for yourself before splashing out for the "upgrade"?
http://www.ptc.com/product/mathcad/free-trial/

http://julianh72.blogspot.com

Pick the trial and not the express. I've tried the express, and its functionality is so limited that it's almost less capable than Studyworks, which predates M11. I think they should have at least allowed the use of the Given-Find functionality, but they didn't.

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@IRstuff
The free trial gives you 30 days of full access to Prime 2.0, after which it reverts to a lifetime "Express" licence with reduced functionality.

http://julianh72.blogspot.com