They work fine, you must be doing something wrong.
The only issue (apart from having to split the audio is just annoying) is that you cant use them over a start marker, a character has to move (just a fraction) from the start marker for sound to run.
To get around it (and there are multiple posts on here about it) you can use a script to move you to the video marker and it will work fine.
Primary Desktop:
i7 7700,k NV1070 8GB, 16GB 3200mhz memory, 1x 2TB Hybrid, Win10.
Secondary Desktop:
i5 4760k, NV960 2GB, 16GB 2333mhz memory, 1x 2TB Hybrid, Win10.
Laptop:
i3, Intel 4000 series graphics, 6GB memory, 1x 500gb HDD, Win8.1.