Manuel,
I have tried many of the commercial sounds available for the Tyros 2 and in my opinion they are not even close to the quality of the internal samples. So my advice to potential buyers would be to buy just the sounds that fill a gap in the Tyros 2 internal wave set, like choirs and vocal samples. On the other hand, there is really no point in buying samples of saxophones or guitars, because there is really no comparison with the T2 own sounds.
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.