Did this one two up on Pan Euro, got teh footrests down a few times. One of our gang on a Harley was like a mobile firework display. Great road.
The road surface on the Les Diablerets side is new and much better than before. Road works still exist nearer to Aigle. Watch our for buses in centre of road on blind corners.
I've done this route three times. It's the best way to get to Interlaaken. If you get stuck behind slow traffic, there are plenty of places where the road opens up for passing. A lot of bike traffic on weekends.
I am back to provide a clarification to the route directions for this trip. Although you can originate this journey in Bex, upon checking my map, I recommend you start in Aigle, two stops further up the A9 from Bex. Go northeast off the autobahn to Route de Lausanne towards Aigle. Turn left in Aigle onto Route des Ormonts. This road changes name a few times (La Frasse, to name one) but ends up called Route des Ormonts when it rolls into Gsteig and then Gstaad. Just don't make any turns and you will find yourself at the other end. Bring a camera. The view of the mountains and glacier is amazing. Visit my travel-log at www.travel-switzerland.net and look for Les Diablerets to see some photos of this trip.
I found this trip by looking for a squiggle on a map; I was not disappointed. The road winds up the valley wall through vineyards and 180 degree chicanes. Pause frequently to look back and see the lake disappear into the haze below you. Take the route towards Les Diablerettes. Spectacular 900 meter granite cliff faces, waterfalls, and open air. The road drops down into a relatively wooded area around Gstaad. Lots of skiing in the winter, but fun for bikes in the summer. Make sure you can buy spare footpeg rubbers when you get home....