Sorry, I misspoke. The Flea 3's we're using aren't the 4K units, the res on ours maxes out at 2080x1552. The issue with Flycap (earlier version) that we have had from time to time is unexplainable crashes/lockups. The software quits running - usually when you are trying to do something difficult to repeat. To be fair, we've recently updated the Flycap version we are running, and haven't had any problems yet. I haven't run it enough to judge it cured, but so far so good. The cameras are well made and pretty robust though. If you've got the money to spare, it's probably worth a look as a curiosity, but I wouldn't expect miracles.