Originally Posted by ecr72
So for anyone looking for portability with this mouse I would advise against it. This is really for someone looking for a really nice home based cordless mouse that doesn't want to deal with a USB dongle or a hub if they have the internal card. The fact that it is full size and rechargable makes it a much better option than the MS Bluetooth in my opinion. I almost bought the MS one but the thought of changing batteries once a week (or less) was a deal breaker.
Those were the reasons I choose MS Elite Bluetooth over the MX900. (plus the fact that MS Bluetooth Elite desktop NEW was 25% less than refurbished MX900 Bluetooth Desktop combo).
Size is a little better for hand grip.
Size is much better for traveling when you throw in charger.
No need to worry about dragging a large charging base hub around. With the MX900 batteries would need to be removed and charged every other day, while the MS would last 2 weeks or more (or in the worst case, 4X as long). I have seen some reviewers of the MS bluetooth state same batteries are still in use after 2 months.
If you are like me, you already have AA batteries on a charger nearly every day. I rotate them in a trickle charger, so I always have fresh batteries to use with my Digital Camera, flashlights, razer, remotes, Garmin GPS, Etc.