I don't mind the extra weight of my Tyros4 over a PSR or other keyboards that don't have semi-weighted action with aftertouch.

Since I primarily do all instrumental tunes, the quality of the melody line is what I depend on to keep the listener's interest, and having that incredibly sweet FSX keybed gives me a lot more control over every sound, especially the SA/SA2 voices.

Semi-weighted actions, by their very name, do add to the instrument's overall weight, but, for my needs, and considering the important benefits, it's worth it.

Mind you, I also like playing the PSR action due to its lightning quick response, but after getting accustomed to having aftertouch, I really miss not having it.

Ian