My love hate relationship with Logitech.I love their products, mice and software in particular. I have an ongoing issue though with the quality as there is always either a double click issue or a failing spring (won't hold down even when pressed) in the right or left or both click buttons. I try to get my warranty honoured and indeed it was once and I did get a replacement but the work that went into getting it was such that I could probably have earned more from an employer and bought another mouse. I have the same issue again, and I have just bought another Logitech mouse to replace it. I am putting in the warranty claim again but haven't heard anything in nearly 2 weeks. I am not holding out much hope of a replacement. So, as it is now, I average about £8 per month for mice from Logitech if you break it down into a bill, which it is really. Once I find another manufacturer whos mice are as nice to use and with the simple configuration software, Logitech won't sell me any more products.