I use "roger that" a great deal in real life, and "roger" in texting.
Brits have a different view of the term "roger".
Also, a while back one of the British players told a story about how he was out with his wife and used the term "mark" when checking the time. She smirked at him, gave him shove, and said, making fun of him, "Maaaaaaaark!?"
Now my wife and I use "maaaaaaaaaaaark" occasionally.