Samsung Np X11

I have had my Samsung np-x11a for 11 months, I only use it for about 12 hours a week and already input keys on the ''mouse'' are worn out and consideering I paid more than £900 for it I expected better, in future I will stick to my old sony vaio systems, my old viao desktop after 4 years old was as good as new when I got rid of it. I also am very dissapointed with the battery life to the extent that I have to keep it plugged in all the time 40 mins and its gone! not good at all