I spent about a year researching tires to replace on my 2008 Lexus RX 350. I replaced my Michelin Green X Latitudes. I was pleased with the life of the Michelin's treadware but found over time the ride became more stiff and the tires cornering was not that good.
Based on the research and commnets found on Tirerack, I chose the Pirelli's Scorpion Verde All Season. After 3 months and 4,500 miles, I can say that these are the best tires I have ever owned. They make my Lexus SUV more nimble with quicker responses to handling and cornering; they provide a smoother, quiet ride as compared to the Michelins; have not experienced any hydroplaning; and they have quick stops.
I know that tire dynamics can change over time and I will have to wait and see if these tires exceed my expectations over the long haul but as of now I am a very satisfied with my purchase.