I use them sparingly, but would use them more if the Pad Creator was better. It won't let you use an SA voice and I have yet to figure out a way to quantize the phrase, which is important to me, especially on a repeating one.
I do use a few premade ones, such as a steel drum or marimbe effect on some latin numbers.
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You can use sa voices, just not the 22 SA2 voices and the organworld voices on the T5