I think good riddance to bad rubbish. yes you have every right to be upset about the way the first nursery handled things and yur son was obviously picking up on some not so friendly vibes there. By all means voice your issues but I would not expect to get any result from it especially since you are no longer there. they sound like an all important arrogant lot of twots and they will more than likely just brush you off as a pi$$ed off "ex" and leave it at that. But yes you are totally justified in your feelings...vent them and move on is my advice, try not to get hung up on them and instead focus on the wonderful rapport you are developing with his new nursery and the fact your son is now getting the attention and care that he deserves!