The main descent of The Gap is quite wide but with lots of rocks. The opening part is steppy and committing the rest is loose and rocky and tricky to control at speed on a FS – good scary fun.
The steepish bit by the ravine near the dam adds interest too.
When you get to the gate at the bottom, go through and look for a wooded bridleway that follows down a stream bed – nice and narrow and full of rocks/steps – it reminds me slightly of the The Chimney on the Qs though more pedally – good bike wrestling.
Overall, the route is easier than the Y Das one. I'm sure there are plenty more techy variations tucked away but I don't know them.
have fun!