Easy to install and works great.

space saver
put one on each side for my wife and myself, and the are very secure and saves a lot of space in the rear cargo for other items

Locks
Easy install works great

Helmet Locks
I think this is a good idea in case you want to carry more stuff on a trip, you have somewhere else to hook up helmets... I have them on my old bike also...

Don't hesitate, buy these!
Was browsing the Slingmods website and came across these. I bought a 2 pack and installation took 5 minutes for both sides. The missus and I wear 3/4 helmets so tough to stow the helmets in the Spyders compartments. The only possible gripe I have is the helmets hang upside down and you know what that means when it rains. But for dinner or museum stops this is the way to go.