>>25353391A bit of both. It's one of the only places in the game where you can't just stomp on through with 255 in everything pokemon, and you have to develop strategies all throughout the dungeon to deal with what you may find. I like the randomness of it, you can make up for bad luck by using pokemon like Drifblim to compensate. Runs are pretty long, though, which can get tedious.
The reward at the end isn't too great, just a Joy/Life Seed. The real, hidden rewards are the Goggle Specs/Tight Belt in the shops from 90-98f. I have never found a Tight Belt.