Underrated shoot'em'ups

Today I was taking a look at my Dreamcast games and came across Zero Gunner 2 again.
For anyone unaware of this game, it's pretty much your basic shmup using helicopters by Psikyo, but with a nifty gimmick: you can change the direction you're facing, much like the PC "Warning Forever".
The first Zero Gunner is apparently emulated in MAME, but I've never played it.
I never really heard much talk about either of them, didn't even heard of the series until 2 came out. It's rather nice and only moderately difficult on normal (with 8 difficulty settings I beleive).

Anyone else familiar with this game or the series?

If anyone else has some shmups they feel are underrated and not talked about enough, feel free to post about them!

>>16

It's almost completely intact from the Japanese version. Even tate is in. All changes are superficial. Whatever the first two screens were in the original (I assume company logos) have been replaced with XS Games' logo and their FOUR PERSON credits. The localization is awful as expected; the manual and most in-game text seem babelfished and then smoothed over slightly. The manual, in fact, mentions a MOBILE LIGHT FORCE 3 ATTACK (bomb). The SCEA-mandated English voice work is, of course, terrible to the point of being memorable.

"I LIKE GIRLS. BUT NOW IT'S ABOUT JUSTICE!"

>>17

Actually, yeah, Blind Korean Guitar Man is a monster.