Hi Bernie
The KN7000 Midi spec will never be as good as a dedicated Midi controller, but if it does what you want, then it will save you money by not having to buy a separate controller. (You can always get one later if need be)
The learning curve will not be quite as bad as a full computer based system, as you will not need to worry about the computer side of things, as the Receptor acts just like a hardware expander, but you are not tied to the instruments the manufacture gives you. (If the facility is available I would get a larger screen to use with it, as it will make life a lot easier)
BTW I started off using hardware instruments (Mainly Organs) and then moved on to a computer software based system, the flexibility being brilliant, but the amount of wires and setup can be rather trying.
A few years ago I moved over to a Wersi Abacus, (A normal looking Arranger Keyboard, but controlling an internal Windows computer, so you don’t notice its there) which has allowed me to have all the advantages of a Computer based system, with the ease of use of an Arranger Keyboard, and I can say without any doubt, that there is NO WAY I would ever go back to either a pure Hardware or Computer based system.
A tip I can give you however is that if you cant seem to get it to do what you want, don’t stick at it, but have a break from it, (Make a Cuppa, Have a beer or whatever) and when you come back you usually find you can sort out the problem relatively easily.
Hope this helps.

Bill