Congrats on making Plat!^
To be honest I don't think I have stayed at a single non-IC Priority Club property in the US since getting Plat (that's where I use my Hilton status), but I have stayed at many outside the US, and with only one exception have always received either an upgrade to a club room, a suite, or both. So I have a pretty favorable impression. Usually I wait until they mention what kind of room I will get, and if they don't I ask about an upgrade.