The difference between the Anantas and Grand Seikos has been widley discussed on the Citizen/Seiko forum. Supposedly the 9R86 in the Grand Seiko is more finely finished and Seiko uses only the best quartz crystals. On the other hand, the 5R86 in the Ananta is beautifully finished, the Ananta is 2/3 the price of the GS, it is lumed (the GS isn't), and it's gorgeous. In terms of performance, the watch has been about +1 sec/week, which is way better than spec, even for a Grand Seiko. And, for me, what is important, is that the GMT function works properly, that is, with an adjustable 12-hour hand.