I've been on 4 turboprop flights (3 Q400 on BE and 1 Saab 340 on NW). On three of those flights, I felt like the plane was jumping around. It's not the same turbulence I feel on mainline or regional jets, but more like the plane is skipping along rather than gliding. On the other hand, I've never felt unsafe on the turboprop, and have no problem flying them. As others have said, turboprops are more tolerant of problems and will probably be more reliable.