I also have the 6500P and enjoy the extra throat space. I love the scissors button when I need to stop in the middle of the quilt.
I have trouble with my needle threader, but I bought mine used.
I miss the free arm part of the time, but the 6500P fits my older Parson cabinet so well. I don't even use the extension table because I can put it even with the cabinet.
I have been reading some negatives about these machines, so please go to a good customer service dealer.