I have also seen the package for AA and BA but looking at the back of the box they would seem to be a product covering the airline and its corporate culture, rather than a 757 sim product. I also would like a good 757 sim.
I have recently been using the '767 Pilot in Command' program, and have to say that it is excellent for what it is. Having said that it is a bit of a 'highbrid' in terms of panels. But the functionality is absolutely excellent, and if you want to practise for your base check, you could do a lot worse.