So is it any good?

I like the game. It's kinda like a cross between L.A. Noir and Professor Layton. The game is a little heavy on the look around the room and find an object type of game play, which I'm not a huge fan of, but I'll live with it because the puzzles are pretty good.

To answer your question about difficulty, some puzzles are really easy and some clues are really easy to figure out, but for the most part the puzzles are a suitable challenge, not too easy but not too obtuse.

There are some gameplay/technical issues with the game. Such as audio cutting out, and the only way to get it back is to quit the game and go back into it. The skip puzzle feature is poorly implemented. By that I mean that after a while in a puzzle you can press the r2 button to skip the puzzle, and the game automatically solves it. This is a good idea (for people who just want to play for the story, or whatnot) but the problem is if you hit r2 you skip the puzzle. There is no confirmation asking if you are sure you want to skip the puzzle. My last technical complaint is there is no auto save, not a huge deal, but would have been nice.

Overall if you are a fan of puzzle games and point and click style games then you will like Sherlock Holmes. I'd give it a 7/10, probably would be 7.5 if they fixed the technical issues.
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"An analogy is a thought wearing another thought's hat" - Britta Perry, Community

I don't think there is a demo in xbla or psn. But I think (I'm not 100% sure) - there is a demo on Steam.
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"An analogy is a thought wearing another thought's hat" - Britta Perry, Community