I live in a region that TD Bank recently expanded into so the old branches have old coin counters that are slow and mix denominations, while the new branches have the regular Penny Arcade with the touch screen with the Penny character, and a Talaris / De La Rue Mach 9 inside. Most of the old machines do not work properly with halves because the coins won't feed out of the hopper into the chute inside the machine. The new machines only put $100 or $300 per bag of halves, but the tellers usually just keep reseating the bag until each one has $500. The $100 limit is because if the halves bag fills more, it blocks the reject tube. I have gotten a few dollars in change from previous customers this way, as well as steel Canadian coins off the magnet in the removable limiter at the top.
I have heard these machines often miscount dimes as pennies, so if you are returning dimes I would use an old, slow "rail technology" coin counter. As for halves, both seem perfectly accurate to me. I'm not sure about cents, but I return a lot anyway since even if I am shorted a little it is worth it for the time saved.