dstiles - 9:11 pm on May 22, 2012 (gmt 0)
I block 199.203/16 on a few sites but not all; I have it listed as Israel, which is always a potential hazard source, but have no bad hits within that range since at least last October.
I still have both bonecho and babya listed as browsers, although both with the caveat "suspicious". Can't say I've seen anything particularly noticable with them.
My experience of non-mainstream browsers, addons and toolbars has been that malformed UAs are the norm. Some right cowboys out there. :(
(Apologies to concientious and hard-working cowboys everywhere!) :)
psychz - I noticed that range a couple of days ago and blocked yet another of their IP ranges.