I have owned the K550i for a year now and it's still going strong. I have not had any major issues with it since purchase and the only downsides i can think of is that once in a while when texting some of my keys freeze up a bit but they do quickly unfreeze. This is not a major problem as it now only happens once every 2 or so weeks (by the way this only started recently). The user interface is easy to use and i have downloaded different themes from the internet which were easy to install. When i got the phone i paid £50 for which i feel is good value for money since it performs most if not all the tasks that a higher end phone performs and now being ayear on i am sure it is cheaper. Overall i think the phone is reliable, quite good lookling but durable.
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