I picked up the Sly Cooper Collection as I had all three of them on the PS2 and they were a blast back in the day. My oldest son wasn't old enough to understand everything and my youngest doesn't even remember them, so it's like a whole new set of games for them. After the initial nostalgia has worn off, I have to admit that they didn't age as well as I'd liked. That being said, for $40, I couldn't pass it up.
I enjoyed the original Splinter Cell on my Xbox, but I don't know if I liked it enough to buy the collection.