I recently got a KNK machine (Maxx Air) and KNK is top quality and the customer service has been wonderful so far which supports what everyone said and what I read before I made my decision to go with a KNK machine, and I did considerable research before making this purchase.
The KNK Zing mentioned by a few posters in this thread has a very good reputation.
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"2 rules to success in life: 1. Don't tell people everything you know."