I disagree with WMD926.
I bought a Brother CS6000i 4 years ago from Walmart for $180. delivered to my door. It is a lightweight machine as stated in the spec. I used it to make 50+ DENIM quilts for our wounded warriors through Operation Quiet Comfort. The needle began to hit metal after this extensive use. I thought I broke it. My local sewing machine repair man refused to even touch it. Found a Brother Dealer/Service Center and took it to them. Their "Tune Up" cost was $119. plus parts. When I declined to have them service it, they tried to sell me another machine. I decline that, too.
I bought another CS6000i because I like the machine. I also make crazy quilts and like all those stitches. Works on costume sewing, too.
When a friend took her Singer to be serviced, I asked if he would look at "my cheap Brother machine". His reply was: Estimates are free. $69. later, my machine is back in service! That is his basic Service Fee. Since then, I have sewn maybe 30 more denim quilts and bound/quilted 8 twin size bed quilts for our local VA hospital on it.
I lent one of my CS6000i to a friend who just could not get used to how light it was. (She went back to her old machine, sewed more slowly on hers and stopped breaking needles. She has now made 10 denim quilt tops for the program. )
Drawbacks: if you get birdsnests under the fabric, stop, rethread and start over. This happens and was the #1 complaint on the feedback form I read on line.
Be sure to clean out the lint and any stray thread pieces or dirt/dust that accumulates inside the machine. It is easy to take apart. There is mostly empty space inside! I use a computer vacuum attachment to get into the nooks and crannies, pulling out the stuff. I do not used canned air. Do not oil this machine. It is plastic and oil only attracts the dirt.
In short: sew slowly and keep the macine clean. Re-thread when you have a problem.
PS- Amazon had the List Price as $600. No way! But I like the machine. Both machines are working great, now: new and serviced one.