I've got a VG-99, VG-8 and a VB-99. But I skipped over the VG-88; at the time I recall thinking that it didn't represent that much of an advance over the VG-8, which I was still (and still am) ploughing the depths of.
But now I'm pondering one. They're cheap on eBay and the completist in me wants that in my collection.
Is there anything that the VG-88 offers that the other units don't have? I still love the VIO functions in the VG-8, and its ability to get back in tune at the press of a button.