Overall quality is excellent. Nike really got it right with this putter.
This putter is so user friendly. First off, contrary to what people say the all green color is not that bad. I kind of like it. Secondly, the alignment aid is one of the best I have seen. I have used a lot of putters in my search for 'the one' (Baby Ben, Odyssey, Ping) and this is it. The feel of it exudes confidence, no twisting or 'yips', the ball goes right where you aim it. Using a mallet takes a little getting used to but once you have figured it out get ready to start dropping strokes. This putter is money.
I guess the only complaint is the head cover, it could be a little less complex. Once you get used to it, it's a small price to pay for such a great club.
Bottom line is if you want to save strokes and are looking for a mallet putter this is the club for you. Price is right ($139 non-demo price) and quality is great. If you are a die hard blade purist this may not be the putter for you, but I would at least give it try you may be pleasantly surprised.