I don't know anything about the Consew you are looking at. However, reading the description on Amazon it sounds like it's for heavier fabrics - not quilting cotton weight. I sew with leather and have an industrial Juki machine for that purpose. I make purses and stuff like out of leather with it. It does NOT sew lightweight cotton. The thread you use is too heavy and the fabric bunches up. I would try to find out more about this machine before purchasing it.
I also have a Juki 150 QVP which is an "in-between" machine (in my head)...between a domestic machine and an industrial. This machine will sew heavier fabrics, at 2500 stitches per minute. A beast! But it does not have a walking foot so doesn't do well on leather and vinyl.
What do you want to sew with this new machine? Are you looking to sew heavier fabrics or just have a faster running machine?