I wouldn't worry about what was said at that shop. I have the same machine you have and am very pleased with it. I did have a warranty issue and when I tried to get it repaired through an authorized shop, she told me flat out that they can't do warranty work on something that was mass produced and would only do the bigger more expensive machines.... I contacted Brother and needless to say they are no longer an authorized company as she had done this many times to others. I found another company who did it for me and didn't have any issues with the warranty. Some dealers think that if its not sold there than it isnt good enough. I say buy what you can afford and it will be what you want... Like I said, I have that machine and my mother has a bigger model, but I like mine the best as it is so easy to work with. If you have any problems I know there are tons of us who are willing to help you out, myself included
Enjoy your new toy!!