I had read AAJ reports and got in contact with a British naval guy who had done some scrambling around the Dientes with the thought of taking some climbing gear over. In the end we didnt as I was still trying to get fitness back and was glad we didnt cart ropes and harness etc around the circuit. Some Ok small sections especially around the lakes but heaps of scree. Some of the rock on the ground looked amazing with big pockets but we couldnt see a wall of it. Looking at the peaks through binoculars didnt look that inspiring. Certainly climbable in a chossy scrambly way to get to the top, but with LGNP and Torres del Paine granite in Patagonia its hard to compete. Very easy now to cross the Beagle channel from Ushuaia in a Zodiac (though like travelling to Sth Australia- dont try and smuggle in fresh fruit or veg), and the boat connects with a minibus that takes you to Puerto Williams.
The Dientes circuit is more popular these days and pretty clearly marked. Looking at the log in the carbineros where you have to register, it looks like 6 people a day on average are doing the walk.