Even £200 for kit that only does what that does, based of what you're looking for, is a huge amount to spend. You've really (really) got to love the hardware interface to commit the time necessary to learn this.
If you're a keys man, making the (possibly wild) assumption you're more comfortable with tech - a DAW is musical instrument in it's own right - does a million times what this does, easier to learn, and costs a fraction.
I'm not by any stretch a techy, but taught myself Ableton relatively easily (Logic, ProTools all much the same) - will give you to all the things you want to (create beats, make backing tracks) but then be creative way beyond the confines of any hardware box.