Hi Nick,
is there a particular reason you want Roland drum sounds? You'd really want to make sure they're going to sound better than what you already have in the T2.
ie Roland may sound better as far as a soundsource goes? but will they necccesarily sound better as a replacement for the T2 drums when it comes to styles?

Main reason I added an sd2 module was that I wanted to convert some of my Ketron SD1's keyboard styles into psr format ( for use with OMB software / laptop). Only way of being able to duplicate the Ketron Live Drums was to play them back via the SD2 soundmodule. The soundsources are similar, but even they require tweaking.

best wishes
Rikki