Ok since IHX comes with the Rockman Rockman demo on the disc I'll give impressions on both.
Rockman Rockman demo
The demo has Cutman's entire stage available in both Rockman^2 flavor and Original Rockman flavor. Both are still rendered in the same engine so the graphics are still really cutesy and in 3D, but the difference is that Rockman^2 flavor is in full widescreen and has a new remixed placement of many things, and original Rockman is in 4:3 in the exact same design of the original Rockman game.
The graphics are REALLY cute and if you couldn't take Zelda WW you'll probably hate this one too. But if you don't mind it, its pretty awesome. Both the original and the remix feel great and the controls are spot on. When you get to Cutman, there's a short voiced conversation that's added (I presume much more plot will be injected throughout the entire game in the final version) that will change my impression of Cutman forever (for the worse).... >_< His voice is too cute and the entire conversation told me that they're really going hard for the "Saturday Morning Cartoon" feel for the entire game. But that aside, I would say props to Capcom for the remake. I'll be buying it like I intended because it's pretty much what I expected, maybe slightly better.
Irregular Hunter X
It's really sad that this game is going to bomb hard because Capcom is spending quite bit on their Rockman/Rockman X remakes on the PSP. The game opens with a solid lengthy anime intro encoded VERY well with a J-rock tune and the game itself opens with another anime FMV, with there being a movie theatre I suspect there are quite a few anime FMVs in this game. The game itself is completely remade in 3D with some pros and cons. The pros are mostly visual as the stages themselves look way better and some enemies (especially the larger ones) are much more impressive. Unfortunately X himself is kinda full of jaggies and its a minor distraction from the game. There's also slowdown when enemies crowd the screen or when you charge your X-buster for a large shot. I hope these don't ruin some of the stages later, but overall loading feels great (developers are getting smarter and I think most of the loading is done when you first power on and done after cutscenes and such, so when you actually go from Enemy Select to the actual stage there's zero loading. I beat the first stage and it feels fine imo. If you liked Rockman X, you'll probably love it. If you didn't like Rockman X, this won't change your mind. It's clearly a remake made for fans and nothing more, but it's a very good token to fans imo.