I am currently in the Windsor Sheraton while my colleague is in the Le Meridian. We both normally stay at the Sheraton, but both hotels are full this week so we had to take a room in each.
My colleague says that the Le Meridian is not a bad hotel. Her only complaint was about the lack of a Chinese restaurant.
From my experience at the Sheraton, it all depends whether you get the "hotel" part or "towers" part. One is very very nice, while the other is just like any other hotel.