If they are going on the 2008 street glide. Harleys adjustable are top notch. The look very clean as well. The kuryakyn ones look a little goofy to me but they fit more than the harley do.
My Freedom Wings work great, but etched terribly from bug guts. Seems to be very cheap plexiglass. Customer service, however, was great, when a hinge broke and I had a free replacements within three days, which were "improved".
I have an 07 and did not like the HD model adjustable deflectors for my year model. Get the ones for an 08! They work just fine although there is one extra hole in them for a bolt pattern on the 08 bikes.