It's a camera that has its niche. For 35mm rangefinder users it handles in a familiar way, and the option of not being full-time panoramic is an attraction. Medium format panoramics (6x12, 6x17, 6x24, Noblex 150) are a lot bulkier and the lenses are slower, and in the case of swing lens cameras, handheld can be difficult unless you have a lot of light, because the rotation time of the cylinder is substantially greater than the exposure time.
Swing lens and wide angle panoramic formats both have their distortions, and sometimes one looks more natural than the other, and sometimes those distortions can be used in interesting ways. I shot 6x17 for a few years and ultimately decided that unless I was going to get a 5x7" enlarger, it wasn't such a useful format for me. Eventually I got a good deal on a Noblex 150, so my pano options are that, cropping from 4x5" or 8x10" or using the half darkslide mask on the 8x10" camera. Swing lens negs can be astonishingly sharp, because you don't have the usual falloff of resolution at the extremes of the frame so a 6x12cm Noblex neg looks sharper than a 6x17 neg to me, both cropped to the same proportions and printed to the same size.