Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Note your model number!

Its funny that reviews are by nature open to mistakes. The review that the Aussie left certainly shows the way this works. Microsoft sold the M54-00001 bluetooth desktop set for quite a while, and there was quite a stir about problems, such as you read here. All those were called back from the stores and replaced with the updated (and now current) M54-00013 version which is soooo much better! The new one has been out only a few months, and the Aussie had his for 1.5 years! The bluetooth adapter is better, the timing is better, etc. The M54-00001's and other of their early kin are still available on pricewatch. They are much cheaper. STAY AWAY FRIM THAT MODEL!!! Instead, go for the updated M54-00013 instead. You'll be glad you did, because it has the feel of a professional keyboard with lots of bells and whistles. For more info, check Microsoft's web page (and read the fine print). Its too bad the name didn't change. My bet is that they were afraid of returns and exchanges.