I returned the size 10 Cliftons and ordered a pair of size 10.5 online. I received the Cliftons on Friday and wore them in the office for a few hours. On Sunday I ran 18 miles in them for the first run. No problems. At 7.7 oz for a size nine, it's hard to believe these shoes are so light and so plush.
I now have the Clifton road shoe, and the Challenger ATR trail shoe.
My life is complete.