Honestly, most of the time we're incredibly happy to see them go. We've had a couple dozen cats through our home in the past six months and of them, there have only been two I was sad to see go--one was Ishka, obviously, but we also had a young black cat who had a neck abscess while he was with us that we fell in love with. He went off to another home, though. We were sad to see him go but happy he's home now.
Here's a better picture of her. She's wearing a Tile (a thing for finding your keys) on her collar because the little demon likes to hide for a nap like no one else and we've spent so many hours searching for her when we're doing headcounts that we decided to put a button on her that would sing when we can't find her!