I fitted the Ognibene sprockets front and rear when I changed to a new D.I.D XVM chain (a year or so ago), and they seemed fine.
Couple of weeks ago had the urge to go down one tooth (16 to 15) on the front sprocket and selected a renthal at a really good price (along with a new tab washer), didn't really notice it being that much noisier, but currently running with an Akrapovic Ti Race can so that drowns out any transmission noises that would have been detected otherwise... 
Main thing for me, one tooth down = awesome pick-up at any revs in any gear especially at lower (town speed) revs, best thing I ever did... I weigh in at 110kg so need a bit of extra pull (!)
I also fitted the 4 degree advancer and set up the exup valve properly for the 1st time, now she really pulls like a train - loving it!