There are problems with the LAME gapless and do not know if it extends to all platforms. Even though I use LAME 3.96.1 with the --nogap switch to encode a full CD from WAV, there are often still audible clicks (very short and quiet) between tracks which if everything were working correctly shouldn't be there. The WAVs play correctly without clicks, can be stitched together without the clicks, and the length in samples of each mod 588 is zero.
One album where this is quite noticeable is Steve Miller / Fly Like an Eagle since the audio volume is uniform across the track boundaries. OGG doesn't have that problem either but I feel everything should work as it should.
I can't currently place this in the bug reports of course.