They're not the best. Trouble is unlike R & G's and Motosliders that bolt directly through the frame. The Suzuki bungs mount to a metal bracket that then bolts to through the frame.
So if you have an off. The brackets that the bungs are bolted to bend or snap which renders them useless. This is particularly annoying if you have lowers because when the brackets bend they bungs dig into your lowers and split them. Making the damage worse.
like this
Some people have reported problems with the R & G bolts bending, but IMHO R & G's are better than the Suzki bungs. The motosliders bungs seem to come highly recommended to.
HTH