I had the GEL-Nimbus 7 in 9.5 that I bought a few years ago, and they were getting a bit old.  I purchased size 9.5 in the GEL-Nimbus 11, and have been very happy with them.  Feel very similar to the Nimbus 7.  Very comfortable.  I just ran a 1/2 marathon with these shoes, without any issues at all.  One thing I will say is that they do feel slightly shorter than the Nimbus 7 ... I'm not sure if a size 10 would fit me slightly better as on the Nimbus 7, a 9.5 was perfect, but the 9.5 is slightly smaller for me in the Nimbus 11.  However, not a big deal, they still fit fine.