Jane and I did this sportive with the Vueltas in Spring 2017 (here’s the “A” team which did the full fat 270K.
“Spring” is a bit mis-leading because it was more like the middle of winter! Jane and I did the middle 155k distance but still managed to do all of the famous climbs and really enjoyed it – they are mostly short sharp affairs – 200/300 meters and often very steep in places (15-20%). It was very similar to cycling in Wales on The Dragon Ride with weather to match!
There’s a very good account of the trip on my mate’s blog here:
megustaria 