I like them purely for the fact that there are some great games I didn't play on their original release/lifespan, such as the Ico games, and the Jak and Daxter games. I prefer to buy a new collection to play on my more predominantly used consoles (i.e. my newer consoles) as I don't have a lot of space to setup old consoles where I live. Plus I'd prefer to buy a copy of a game that supports the devs and publishers rather than tracking down a used copy of the original on ebay. Not to mention sometimes older games become rare and expensive. I'd rather get the live arcade download of Castlevania SoTN than spend £80 on the original PS1 version. As much as I do like owning physical copies more, it's a big price gap that dominates my decision.