Are they worth the extra cost?
Or am I better off saving a bit of money by buying the wired version?
Have you researched prices lately? I don't think there's much price
difference between equivalent wireless and wired printers of the same
features, if you can even find a non-wireless version. When I shopped for
a home printer last summer, it seemed all the newer models had wireless.
All the wireless printers we looked at also had ethernet and USB
interfaces.
There is no general answer possible to your questions. It depends
entirely on your situation. Only you know. Wireless gives you a slight
extra degree of flexibility that might come in handy later, even if you
don't think you need it now. But if you are sure you will never want it
within the lifetime of the printer (which may not be all that long), and
can save some money, or maybe upgrade some other important feature, then
by all means don't get it.
BTW, we got a wireless printer, but use it wired all the time!