i want to buy a new mouse for my laptop but i dont know what i want. I have a vaio sz230 with integrated bluetooth (only has 2 usb ports). i dont know if i should get a bluetooth optical mouse this way i dont have to worry about a reciever, or if i should get a rf wireless laser mouse, then i have to plug in the reciever. im debating between the logitech v270 and v450, or if i should get the mx900 which is bluetooth and laser. so my questions are can you notice a difference in lag between bluetooth and rf? how much better is laser compared to optical? How long do these batteries last in these 3 mice? if you have an answers, suggestions, or anything post it cause i really dont know what i should get.