Last September I completed the Mont Blanc Summit via the 3 Monts route... Belated post as I only just realized the post was in draft and not published...
The above was recorded with a Forerunner 405, unfortunately it ran out on the way back, hence the red waypoint on the route back. You can view the log at Everytrail.
The route comprises of a quick start down from Aiguille Du Midi station, down the ridge pictured belong, then along the glacier and up to the Cosmiques Refuge.
The Cosmiques refuge was the start of the summit, with an easy trip down from the Aiguille du Midi station, we had a short day the first day.
The first peak to complete was Mont Blanc du Tacul, a fairly steep climb with numerous unstable looking seracs:
Once we were down the other side of the peak it flattened out, and on the way back we stopped for a quick bit of food/water on the Col:
The next peak, Mont Maudit had the most technical bit, an ice climb at the top of the peak, pictured below.