I used modules in the past, specifically RA-50, RA-90, RA-800, and I must say, I am totally happy with not having to use a modular setup anymore.
Fiddly, and time consuming setup, more things to put away, and more things to go wrong...plus, access to a module's controls, even with a well set-up controller, is not nearly as convenient as having it all on the panel, with clear labeling and a nice informative screen.
With so many excellent new styles available, especially Yamaha styles that now use mega and SA/SA2 voices, the argument of "better" styles (and bass lines) holds no water anymore, in my opinion.
And with even high end arrangers weighing less than 35 lbs, with the mid-range at only 20 or so, the weight factor isn't nearly what it used to be.
So basically, it really boils down to overall sound, and what we like to hear coming out of our speakers.
I'm glad Yamaha's sound appeals to me, and I can get everything in one unit (in my case, a Tyros4), as I know I wouldn't have the patience to be jiggin' around with a module and controller, and having to deal with it's disadvantages, for a few dubious (in my opinion) advantages.
But, to each his own.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.