I should say that the seller responds quickly. Unfortunately, I didn't get my order and asked for a refund after 2 weeks of waiting for the real shipment. Firstly, the seller provided a fake track code and offered to send me the PM981 instead of improved PM981a. When I refused this offer he suggested to wait for stock up. Over the next 10 days the seller added the "RANDOM SHIPMENT" image to the lot which indicates a random shipment of PM981 or PM981a, and drawn my attention on this image. At this point I was already very tired of this store and even agreed to receive PM981 instead of the ordered PM981a. However, in the next 3 days nothing changed and I asked for the refund. Moreover I fired about $13 discount on this order :( Definitely 2 stars due to quick and responsive communications.