I've got one old-style Wave and have decided to grab another. Mine's served me well, carries well, fits my hand well, etc.
I don't think I really have a need for the drivers/bits ... just more stuff that I can lose.
I suppose to some degree, it's a matter of preference.
Personally, I don't think I've a great need for the better blade in the new Waves, don't want the removable bits and will just buy another old Wave before they become hard to find. Saw one at the Target store this week. Think I'll go by tomorrow and buy it if it's still there.