You don't need them until your doing rollups, so it would just be another thing for your lines to catch on.
Then its a big day when your reach the level to install them. Still remember when I reached that point and installed the yoyo stoppers on my Shadow. Good memories.
I have roll bars on my Talon and DS. I like them better. Easier to get out of line wraps and easier to catch during roll ups. But then again I don't have the best skills in the world.