As far as I know, the Shadow derailleurs are 10-speed, not 9-speed. They are not compatible with road bike shifters. That's why I used an older Deore XT 9-speed derailleur with my new 10-speed 11-36T Shimano cassette (and kept my 105 shifters). My bike is a compact double. I would not need quite such a big cassette if I had a triple.

I can't believe how well it works! It shifts with just the tiniest touch, although that might just be because the mechanic is so good.

Today I went on a ride that includes a very long, steep uphill - probably 3 miles with no breaks (fantastic downhill on the other side). I have never been able to get up this without stopping several times, sometimes walking. I rode up the whole thing in one go. My cadence went from 30-35 with the old cassette to 50-60 with the new one. Plus, my quads were not burnt out. I felt really good today.