Got one of these at work. Not a bad set, but it's just not worth more than $50 in my opinion. Plus, this is the old outdated design. The new one, even more ludicrously expensive, features a charging stand for the keyboard. Battery life is excellent for the keyboards (> 1 year of daily use with standard alkaline batteries), not so good for the mouse (about 2 weeks) so don't forget to put it back into the charging cradle. The mouse battery is not user-replaceable.

nothing can justify the kind of price logitech is asking for this, even after rebate.