I played through them a few years ago. They were pretty fun overall, but I enjoyed the original trilogy + Rise from the Ashes and Investigations 2 more. Otherwise I think they're better than the rest of the series (4, Investigations 1, Professor Layton VS, 5, 6).
Chronicles is a port of the two Dai Gyakuten Saiban / Great Ace Attorney games on the 3DS. The first game was made with a sequel in mind, so it leaves a lot of plot threads hanging, which makes it feel lacking as a standalone game. In contrast, I think even if you stopped at 1 or 2 in the original trilogy you'd be able to feel satisfied.
The games take place in Meiji-era Japan but also in Victoria-era London. The main character is Naruhodou Ryuunosuke, a university student and ancestor of Naruhodou Ryuuichi / Phoenix Wright. シャーロック・ホームズ / Herlock Sholmes and Natsume Souseki also appear as characters. Personally I'm not familiar with Sherlock Holmes, but I think The Great Ace Attorney contains many references to the original stories that were written about him, but the games are still enjoyable even if you don't catch them. Natsume Souseki is caricatured as referring to himself in the first person as "wagahai" due to his famous novel Wagahai wa Neko de Aru.
In some respects they feel like a spiritual successor to the Professor Layton crossover. They share the same director/writer (the guy who also wrote and directed the original trilogy), the same main composer, London as one of the settings, and mob testimony.
The soundtrack is great overall but feels different from the other games except the Layton one because it relies on more period-appropriate instrumentation instead of, say, square waves and electric guitars. The tracks associated with Asougi and Susato blend Japanese and Western elements in an enjoyable way similar to what >>119364
described for Utawarerumono.
Unfortunately the Western releases lack the option to set the text to Japanese while the Japan and Asia releases let you switch between Japanese and English as you please. The first three Japanese DS games were like this too, except that in those games each language gets its own save file, while here you can continue right from where you left off in the other language. Also the port doesn't feel like the definitive edition bPost too long. Click here to view the full text.