yes, it's difficult for Nero to burn a perfect gapless disc.

I mean, if you manually delete the silence at the beginning and end of MP3 tracks in a perfect way, it's almost impossible for Nero to correctly burn them because they're not multiple of 588 samples. This is a job for Feurio! and "no pauses" setting.

With Foobar2k you'll probably get a disc with no perceived pauses and it will be fine most times. I guess it's possible to get a "click" between tracks if, by chance, there's too much difference in volume between the end of a track and the first samples of the following...
Anyway, it's a good way to do it automatically...
To do it with everything under control, use Feurio!