I have used hacks before many years ago, but after using them a few times i found i actually played worse because i tried so hard to make it look like i wasn't using them (plus in the case of FleshP's wallhack, one would lag alot more than normal).In recent years i have only used them while watching demos to try and sniff out wallhackers. This method has proved to be very, very useful.The most amusing hackers are those who don't try to hide them. You'll be camering someone and giving recon and notice that he or she seems to be staring straight into a crate which doesn't make sense. Then you go watch the demo with a wallhack on afterwards and notice that he or she was staring straight at your teammate through the crate (i.e. GaNja).