I've got a mate who has just got one of these, he also has the ASG version which we have upgraded a bit. He is very pleased with it, likes the feel over the ASG because of the extra weight however the double feed issue was so much worse than the ASG out of the box, even using the 'approved' trigger pull, however a bit of time spent filing the feed lips has cured the problem completely as it did on the ASG .
The ASG has had the silencer modded to act as a silencer rather than as a barrel extension by cross drilling the barrel extension and fitting foam into the silencer. Having shot both, Performance wise there is nothing in it, both have great range an accuracy, and both are amazingly quiet. I would agree that the Nov feels less toy like because of the extra weight but the modded ASG is every bit as good and with the cost of the upgrade parts ( hop rubber, I key and TDC ) owes him less than £100