I've used both Rhino and BobCad-Cam. I really wish I'd spent the extra cash to buy Rhino. At the end of the day they are leagues apart. I've got V22 and its downright unfriendly.
I've managed to side step this though by using Google Sketchup with a plugin to generate DXF files

and then only use BobCad-Cam v22 for the code. Even then I edit it.
Customizing the program to suite your machine is impossible and the BobCad-Cam team are not very helpful. The last time I contacted them with full specs of my product the only reply I got was phone me from the Training Sales Manager.
I still use the program but admit I loathe using it. I think BobCad-Cam are a bunch of amateurs that scam people out of hard earned cash by using very excellent sales techniques and promises they never intend to fulfill.
Only my wife has gotten any joy from BobCad. I was drinking huge amounts of very strong coffee to stay awake during the training videos I got with my package. She thought it very funny as my head nearly hit the desk as I battled to maintain consciousness with that monotonous voice.
For a package not worth more than $100, I feel really cheated by BobCad.