I don't think that "most" cyclocomputers are wireless, I still see more wired computers for sale than wireless ones. As far as the total weight, I think they're fairly even because even though there is more weight in the pickup due to the battery and the transmitter and probably more weight in the computer itself due to the receiver, there is no cable so I think it just about all evens out.

I have a Ciclosport CM-434 and it a certainly a lot less clutter. The one downside is an extra computer mount is not cheap! (I think if I wanted to buy another mount for the CM-434, it's like $70 versus $13 one for a Cateye Mity 3...

Jay