Since I had done for years with Microsoft mice excellent experience I rose from my old, non-ergonomic keyboard on a Microsoft Comfort Curve Keyboard 2000, now by this I BeSite the third copy in almost 2 years. I was very pleased with the handling at this time, you can write it quite pleasant. What stands out far less positive after this time is the Verschleis. Has the first keyboard still held almost a year, is the width to already failed a few months and the third starts now after 4 months again with first quirks: individual keys produce in pressure only occasionally the desired icon, later the affected keys respond simply do no more. One star for the lousy half-life, a bonus star for comfortable handling. Conclusion: after the warranty runs out now (to be desired and also the customer service leaves something) I'm going to switch to other manufacturers.