PGA's Stealth is extremely smooth, that is for a Vekoma coaster. But I didn't expect it to be rough and it figured that it wasn't rough at all. But the only thing uncomfortable about the ride was the super Gs pulling you against the complicated restraint system and your whole body is like resting on this jet fighter type strap the whole time you're in the flying position. But the coaster was smooth. And X won't be rough due to its future riding on the 4th Dimension. The 1999 Tennessee Tornado @ Dollywood was extrememly smooth and it was an Arrow multi-element.
