Amazon.com is addressing complaints about its new Kindle Fire device, with plans to roll out a new software update in the coming weeks. But even though some users aren’t completely satisfied with the performance of the $199 tablet, the online retailer continues to rack up sales.

The latest figures in the guessing game around Kindle Fire sales comes via Goldman Sachs, which notes that Amazon is on track to sell more than six million of the 7-inch screen devices this year.

Next year, Goldman Sachs estimates sales of between 15.5 million and 20.5 million, with many shoppers driven by the low $199 price tag.

Amazon started selling the Kindle Fire last month, and John Paczkowski at All Things D notes that if six million Kindle Fires are sold that the company would surpass the total domestic sales of the iPad during the first December quarter in 2010.

Earlier this month, financial analyst Shaw Wu cut his estimate for Apple’s tablet computer from 15 million to 13.5 million units for the current quarter, noting competition from the Kindle Fire.

Previously on GeekWire: Kindle Fire users report Wi-Fi bugs

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