I bought this a few days back, and for me, the Indiginus strum engine, and keyswitching is way more user friendly, and also has more flexibility for creativity that the one in the OTS guitars . . . but the larger sample sizes, and extra nuances of OTS do sound better.
Wish I could just create in Indiginus, and switch to OTS for final mix export. (too bad, I haven't found a way to do it)