Well to be fair, have you ever actually pulled the LCD out and decided to use it to really try out the difference? Or are you so generally happy with the TB-6 and afraid of having a problem with the LCD on a paying client job that you've simply been unwilling to give it a chance? Something to think about although it does split the argument both ways--that TB-6 does work great.
I tend to Agree with Alec, I have used both and the TB-6 is too good not to use. LCD's still have a long way to go before they are bright enough, reject sunlight well enough and have a large enough viewing angle before they displace CRTs.