Though I think I ingested most of them, there were still plenty of black flies to go around in Lake George (Cat & Thomas Mtns.) this past Saturday. I used DEET, got a few bites, but not too bad. One in our group was new to these critters and they drove him insane, even with DEET and a headnet.
Of course, reports could vary widely from day to day and location to location, given the weather, wind, temps, etc.