I agree with you that it's a nice piece of equipment. But, and here comes a big but, it has one major drawback. It doesn't have an on/off button. Why would you consider a bt mouse over rf? For a desktop solution you'll need the charger anyway, thus you could get the mx700. The only reason I see is to get a bt mouse for a laptop which you would desperately need an on/off button for.
So while I see your point, I don't thinks it's viable towards chosing the mx900 over the mx700.
So while I see your point, I don't thinks it's viable towards chosing the mx900 over the mx700.