I bought the physical JP trilogy on a whim, and have been playing it ever since I got tired of Smash Bros. So far I've played through AA1 and 2, and am currently starting the second case of the third game.
One thing this series did is show me that I actually do enjoy adventure games despite how gameplay is more of a background element compared to the setting and plot. Even if there's a single valid solution at any point whenever you're required to present evidence, press a statement or point a contradiction, I like how I could figure most of them out. I did reach out for a FAQ at times for the final cases in AA1 and some points which stumped me throughout 2, but I've decided to let that go for the third game since it does take the fun out of solving things away, even if it's a pain having to re-do stuff you already solved if you mess up too many times and have to reload an earlier save.
Once I'm done with the third game I was thinking about buying the Layton crossover and AA5, and might be getting AA4 and AAI1 from a friend of mine who lives in the US after noticing I can't just buy the JP versions because they have no English language setting unlike the GBA games (might end up buying AAI2 while I'm still in Japan, though). Given how plot-heavy this series appears to be so far, would it be better if I held off of playing AA5 until getting and beating Apollo Justice?