http://sewing.patternreview.com/Sewi.../Review/1/3652
I don't know anything about this machine but found this review that may help you. What I can tell you is that I have a Brother NX 2000 that I love, a Brother PR 620 embroidery machine that I love and a Brother serger that I am learning to love as I learn to use it.
My Brother machines are very user friendly and have been easy to learn. The accessories are reasonably priced. My NX 200 has a large table like the 450Q and that is one of my favorite things about it. The 450Q looks quite a bit like my machine and seems to have many of the same features. I love my machine and have never looked back after buying it. It has allowed me to explore some stitching skills I never had.
Good luck in buying your machine.