B&O own plasma displays are all Panasonic, so it naturally works better with that - however there are several users in here who are using a BS3 with other plasmas as well and also some with LCDs. Since the new BV7-40 now comes with an integrated BS3 (correct this please if it is wrong) I suspect that B&O has software updated the BS3 with changes that improves integration with LCDs and not just Plasmas.
When all that is said there are several cases where the image quality deteriorates with a BS3 connected instead of going directly from the source to the TV, so my advice would be to try it out. Go to a dealer and convice him do a demo setup with your tv. Either bring the BS3 home to your environment or take the TV to him.