Martelli is really new to the machine quilting scene. Compared to other manufacturers, there are fewer users and fewer comments to be found online. If this is the only sit-down quilting machine you have tried, I would definitely recommend trying others which may feel equally good to you and have a more solid track record in the industry (and perhaps a dealership closer to you for problem solving). You can do some cost comparisons online. Alternatives to check out would include the Handiquilt Sweet Sixteen:
http://www.handiquilter.com/machine/HQ_Sweet_Sixteen/
and the APQS George:
http://www.apqs.com/machines/george/
Both of the above have been around for years and have many comments about them online. (Also check for threads here on the QB.) George is the one that Ricky Tims quilts on, I believe.