Bernie, I would not rate the Axiom keys as "stiff". In fact, I had a difficult time seeing much of a difference in resistance between the so-called semi-weighted keys and the regular "synth" keys on the Oxy 49 and others. I would say the feel is no more stiff than my Yamaha 9000 or other such models. However the "bounce" is moderated, and I find the overall effect rather good. Not at all like a true weighted KB in any sense. But I cannot play as fast as I can on my Yamaha arranger boards. Not yet, anyway.

I actually like this model quite a bit and find the $50 USD differential worth it for the additional functions. It is -- however -- noticeably heavier than the Oxygen model. Yet still far lighter than most arrangers and many full synth boards.