If they are anything like the cheaper options for the Tuono that I've read up about, folks complain that they tend to flex and bend fairly easy. Would hate to snap a brake lever when you really need it (not that anyone should really be standing on their back brake that hard, but hey, sometimes it's fun ;-) ).
2009 Aprilia Tuono - Ginger
2001 XR650R BRP (Big Red Pig)
2006 Honda 599 - Ex wrecked it :-D
2007 Honda CB900F (sold)
2006 Honda VTX 1300C (sold) YouTube Channel
That's another great option. Just to be clear, the ones I posted are rotatable about the mounting point to you can go pretty much wherever you want, including downward.
I wanted to go back to give myself some more room for my feet so I went back and down. An unexpected benefit is that I've found I can now span the distance from the passenger pegs to the front pegs with my feet. I flip the passenger pegs out when I'm going to go on the highway, put my heels on back, and it makes for a really comfortable riding position.
Pretty sure none of those Chinese ones will actually work on the CB900F. CB919 is essentially the later variant of the CB900RR, and I think that is the market those pegs are oriented towards. I may be incorrect though. I just didn't want someone seeing 919 or CB900 and getting confused
88 Blue Hawk (NT650) Project Pics - http://tinyurl.com/clw8h3q
2000 DL650 - Being ridden but make me an offer if interested...
2002 DL1000 V-Strom