I have a sweet 16 which has given me not one bit of trouble. I think those who have trouble with tension are afraid to really crank the top tension - it is not at all like dsm machines and needs to be turned one to one 1/2 times.
My dealer is about an hour or so away. I hear that HQ has excellent service. My dealer is exclusively an HQ dealer so I got excellent training in how to use it.
Many companies have gotten on the bandwagon and are now making sit downs. Make sure your dealer knows how to train you and knows how to set them up.