Joey taught Bobby, after many years apart, they decided to share a shop together again and make a go of it. It didn't work out, Bobby is out on his own in the Chicago area working on putting his shop together. Both are great cuemakers, but I've always preferred Bobby's Hit over the Cog's although I have played with some cogs that were jam up as well.
Bobby never used the G-10 and won't because Joey originated it, and that would not be a respectful way to treat someone held in high regards.
I tried talking Bobby into doing a cue together with Joey last year with the G-10 as well ( sort of a Cog-Hunter cue), but it was a no go. If it happened, it would have to be one a $25k plus cue to even get Joey to think about it.
So.... there ya have it.
Carmelli and Steve Klein both have a similar hit and feel, although I haven't found anything else out there that would fit the bill.