A pretty good collection with a nice lineup of games. It includes practically all of the major classic titles (i.e. the ones that aren't metroidvanias) except for Rondo of Blood, which is admittedly an unfortunate exclusion. It does include Japanese versions of most of the games however, which is a nice bonus.

In terms of extra QoL features, the collection leaves a bit to be desired. They've added a save state function, but there's only one slot per game and no options for rewind. There are also a few visual customization options as well as a replay feature that automatically records your gameplay, but that's about it. The collection does come with one really cool thing though: the digital bonus book. It contains stuff like concept art and developer interviews, and it's pretty interesting to look through.

Even with the slightly lackluster extra features, I think the game is worth its price tag. It's relatively cheap and seems to go on sale pretty often, so keep an eye out if you're interested in the old school Castlevania games.