I own the K3 now for about a month since I the price of 99, - could not resist EUR Amazon. The four stars stand for the qualities already sufficiently described by Lieve-Jong. I have forgiven for the battery power the missing star. True to the recommendations in the manual I have the battery BT50 emptied twice and then fully charged. Then I tested the call duration to shutdown of K3 because the battery is flat. The then was the first time at 35 minutes, the second time in just under 40 minutes. According to the data, the call duration will be at 237 minutes. Maybe I caught a faulty battery, because the reviewers of "connect" and the reviewers here evaluate the battery performance with good to excellent.
I have posted the phone and get back yesterday - with a new battery. I hope that it really was the faulty battery. I will again announce me after a reasonable trial period here say.
Incidentally, I must say that the reception as well as the voice quality are excellent. As example, Sony Ericsson can cut off an entire loaf of ;-)