Originally posted by: Tig Ol Bitties
I've owned the mx-518, currently using a G5, and I must say the G5 is noticably more precise for me being that it is laser technology. The MX-518 is no slacker though and it has that extra thumb button, but I hardly ever used it, so the choice was easier for me to make going with G5. The extra weight cartridges is a plus...I found the MX-518 a bit too light. Either one would be a great choice...won't comment on G7 since I never use wireless mice.