I also have the Brother PQ1500, mine also has the knee lifter, and the auto thread cutter. As an aside, got it from Allbrands, best price I found at the time. I also got excellent customer service from them. I love the machine, so far have not had any problems with it. I just got a Grace frame to use with it, dh has the frame all together, but I haven't tried it out together yet...I think I am overwhelmed with actually putting a quilt on the frame and giving it a go...lol... Good luck with your new buy, whatever you choose...just have to "throw my hat in the ring" with good things about the 1500!
Regards,
Kif