Heyo, just wanted to pop in and say thanks for this service.  I've come into some unexpected car trouble and needed to liquidate some of my Bitcoins, and LocalBitcoins has helped me a lot in that regard. 

Out of curiosity, have you changed the fees for cancelling an ongoing trade in the past week or two?  When I did my first trade last month I noticed a cancellation option but didn't need it since the trade went through successfully.  A few days ago, another person I was selling to needed to change the withdraw address on-the-spot and I saw that it didn't charge me a fee to cancel the existing trade even though it had already been funded from my LocalBitcoins wallet.