I have the Queen Quilter 18, made by Tin Lizzie. (It's for sale for $3,500). I've had it for 4 years & just upgraded to my dream machine - an APQS Millenium. I've never had any trouble with the stitch regulation, not had any problems with tension or anything else that wasn't operator error. Tin Lizzie factory is just a phone call away & always very helpful & don't make you feel dumb for asking questions or helping you through whatever your problem is. PM me for anything, you're in my neighborhood.