I'd agree with Mick about keeping EBB's clean and well looked after. It depends on the type of EBB to some extent, but ones that don't use split shells or grub screws to hold them, such as the Niner style rely on pretty tight tolerance to stop them slipping. If they're not taken out now and then to clean both the BB shell and the EBB itself, they can seize badly and take a fair bit of swearing and heavy handed techniques to shift them.
So long as you keep them sweet though they're no problem.
I'd agree with Mick about keeping EBB's clean and well looked after. It depends on the type of EBB to some extent, but ones that don't use split shells or grub screws to hold them, such as the Niner style rely on pretty tight tolerance to stop them slipping. If they're not taken out now and then to clean both the BB shell and the EBB itself, they can seize badly and take a fair bit of swearing and heavy handed techniques to shift them.
So long as you keep them sweet though they're no problem.