I have a singer 251-12 which was "ok" and I managed to get my seat covers for the front buckets sewn with it but wasn't easy. Not to mention getting used to it vs a home machine and I never really did much on a home machine either. I'm waiting on a 111W155 to get here so I can figure it out.
I can't afford a servo motor at the moment but somewhere read that some foam stuck under the back of the foot pedal helps and it sure did. I had a hard time starting and sometimes would go too far and be like stomping the gas on a jet or something! The foam gives me a little more resistance to keep it under control better. Should be interesting getting used to a whole different style of machine but sure should make things easier when sewing vinyl once I do a bit of practicing.