Stereotypes of income and music ability aside, I have an XK5 and a Leslie 3300. The onboard sim is not terrible, but not great. The sim on my Nord Stage 3 is better in some ways, for example the overdrive is better on the Nord. I definitely would not buy an XK5 for the onboard Leslie sim. I would, however, buy it for the overall tone, controls, keybed, and playability. It is amazing in that regard. And, of course, it sounds great with a outboard Leslie