For me Llandegla is the kind of place thats fine if your passing but its not worth a special trip.
Because its quite BMXy, ie smooth, bermy and with jumps, its quite good fun to blast round and at only 21 smoothish km it doesn't take long. Makes a good night ride too but I'm not sure on the sketch with riding there at night at the moment.
It does get pretty busy though on weekend and bank holidays and this will certainly stop you blasting round and spoil the fun.
Definitely plan on doing a lap in passing at some point but avoid it on a bank holiday especially.
Enjoy Penmachno 🙂