I've just returned from there, was staying in a mate's chalet above Verchaix.
Les Tines is decent enough, bit sandbaggy. The ukc logbook highlights the decent routes. The 6c 'Dolby' is v.tough, old school and runout but good.
Anthon is very convenient - 10 seconds from the road - but all routes I did were polished horrorshows. Whatever you do don't try the 7a+ up the crack on sector turbostyle.. actually yes do it it's reeeeally good....
Jourdy is good. Steep hike up to it. Nice multi-pitches and some decent single pitches.
If you can hook-up with someone competent then highly recommend going to Les Vaurdes - one of the big cliffs above the Arve valley. It's mental. Look it up. La Costa is a massive sandbag although I was leading everything with a newbie to climbing - felt like a meaty 250 metres E3 6a. You defo want cams. The 250m 6b I did on there last year felt 2 or 3 grades easier than La Costa. Tip - you can get up the 4x4 track in a normal hire car if you fill the ditch/bump with offcuts from a firewood pile.
We hiked up to look at Paroi Antern - amazing huge cliff in a very beautiful setting with a nice refuge at its base. Very inspired to try something on this on a return trip.
Eats - La Reposette
is very good and serves late.