We were on the Grand last year in 2010 on a Med cruise, and again on this post dry dock trip.
This cruise was different in that the majority of the fellow passengers were much older clientele and many had mbility issues. It was end of June, so not all schools were closed here in the UK. This did not affect us, but was disappointing for out 18 and 17 year old boys, as there were very few of their age to congregate with. Having said that, by the end of the cruise they seemed to be having a good time!
The main changes on the ship are in the Piazza and the casino. These areas have been transformed beautifully. The rest of the ship remains much the same. The cabins and balconies have not been refurbished, and I think these are the areas that some people may have issues with. The balconies are showing their age...rust is rife. Having said that, this did not affect our cruise in any way.