There's just been a long debate on the Airheads list about safety bars with several claiming they can bend the frame in a spill due to the long leverage on the mounting points. If that's the case, replacing valve covers after a spill would be much cheaper.
My bike came with them fitted but I removed them 12 years ago. What persuaded me to do that at the time was Duane Ausherman's view that they could cause a high side in in spill. He claimed that every bike that came into his shop after a spill had higher repair costs if it had safety bars. Secondly the extra width wasn't helping squeeze past my car in the garage. I hadn't even thought about bending the frame.