Any fan of Castlevania or side-scroller will most definately enjoy this title.
There are 2 games that you can unlock: The original Rondo of Blood on the PC-Engine (Turbo Grafx 16 CD in japan) and Symphony of the Night.
Having played the original in some format, this version is exactly the same as it was on the PC-Engine. Difficult gameplay, alternate paths and bosses, as well as some maidens to rescue lie in the version. The remake is easier since you can have some control in your jump, but not present in the original. You have the option of choosing Japanese or English language voiceovers, and although the voiceovers are a little cheesy, you won't have to figure out what they are saying in Japanese.
Symphony of the Night has a lot of new improvements. New voice acting, redone sprites, and the ability to play as Maria. However, I played the Sega Saturn Version and I was very upset that Konami did not add any of that content to the PSP. No more Maria being able to collect 999 hearts, using the classic sub-weapons such as the Axe or Cross, or using her kicking moves, no more Underground Garden or the Cursed Prison to explore, and some other things I noticed as well.
10 items that was in the Saturn version for Alucard aren't present in the PSP version. That means no Alucard Spear. :( Also, no Boots of Godspeed for Alucard as well (Relic for Alucard that allows him to run twice as well).
For Richter, no alternate costume and no automatic backflip when the slide kick is executed when it strikes anything.
However, there is a boss battle for when you fight Maria as Alucard.
Another drawback that I have is the 4:3 borders for playing Symphony of the Night and the original Rondo of Blood. They are quite annoying and that can not be changed.
Otherwise, this game is a very good investment for those who are die-hard Castlevania fans. I noticed that I died less in the remake than the original title. You will truly enjoy this title and you should get this game NOW!!!!