Short version-
Go - Get - It!!!
Long version-
I had XR2 but sold it. It just took me too long to get any CAD done with it. It seemed like I was constantly clicking through boxes to get a simple line drawn. Irritating! Maybe I was just doing something wrong but I think not since I have seen that complaint from other users. I bought RhinoCam since I was familiar with Rhino's style of CAD, it was fast, and I liked that style.
I recently went back to OneCnc when I saw XR4 because of the new high speed machining abilities and I just forced myself to try to get used to their CAD style. I managed to stick with it because of the HS toolpaths are awesome! But.. the CAD process was still slow going.
I just installed my upgrade to XR5 and they have completely re-designed their CAD process and eliminated almost all of those annoying clicks. It makes their CAD soooo user friendly now- very much like the Rhino style drawing but with the accuracy of OneCnc. Combine that with a great OneCnc CAM system and I think XR5 is going to be a huge hit.
So, from one random anonymous guy on a message board to another - I highly recommend it.
I think you can do a web demo with it or something to try it out and see if it is worth upgrading.