I bought SSD4 Platinum with the classic and deluxe samples, and then bought the CLA expansion, though don't have the Terry Date expansion.
Although the CLA expansion sound really good, they are processed and the sound you hear in the demos, is the sound you get and can't really alter or EQ that much. That's not a bad thing, because that's exactly the point with the expansion pack, but the best way to decide whether or not to get the expansion packs is if the demos sound like the drum kit that you want - if they don't, then you're probably not going to use them.
I normally like to start with a clean slate on a mix, so raw deluxe sounds work better for me, and I don't find myself using the CLA expansion pack that much, and is why I didn't bite on the Terry Date expansion - they sound damn good, but I can't see myself using those kits for one of my songs.