In reply to RoK:
As others have said if buying second hand check to ensure the device isn't recalled, also check for wear (furry lanyards etc) and age as most manufacturers recommend around a 5 year lifespan. Buying new shouldn't be a problem as no reputable shop will be selling recalled sets.
Karabiner style is important as it needs to be easy to operate (I found some of the larger krabs awkward in my girlie hands) repeatedly. These days screamer (rip) style devices appear to be most popular.
If buying a replacement set I would pay extra for longer lanyards - in many cases following the cable too closely puts you onto harder climbing.
Just got back from Italy and the sets are slightly cheaper over there, also there are many "cheaper" brands not seen in the UK which well undercut what you would pay here.
We used thin leather builders gloves, far cheaper than the ViaFerrata ones and worked fine - spoke to lots of people who had found "proper" ViaFerrata gloves wore out very quickly.
Don't forget a helmet! Freaked myself out after a I knocked a stone off a route and it narrowly missed people in the kitting up area (where we been sitting without helmets when eating lunch).