Okay, here is my opinion of Tyros owner.
I think that the Tyros has the "average" key feel of all the 61 notes plastic keyboards, maybe a little better than -say- a Roland VA7 and definitely better than a PSR 2000 (I think that it's a matter of spring calibration, but am not sure).
I think that a light action is better to play things like a synth solo and gives also a better control of the aftertouch, but to play with an acoustic piano sound a heavier action is definitely adviced. So the ideal solution -to me- is to own at least two keyboards.
I used to own a Yamaha digital piano with 88 weighted keys but the action was too heavy and my wrists used to ache after a while, so I think that the best compromise is a 76 notes semi-weighted keyboard.
Among the keyboards I have owned the Yamaha 9000 pro had one of the best actions I remember and I am tempted to try out (and maybe buy) a Korg PA1-Xpro just because everyone speaks well of its action.