Oh, on the note of 32X hardware issues, I have heard that some of them have problems. I think that some of the more common things that go wrong with 32Xes can be fixed, if you know what you're doing, but yeah, the hardware can fail. Mine is fine though.
Not to be too contrarian, but it's interesting how tastes vary within a genre. . .
Sometimes I feel alone in disliking Truxton--even the arcade version. The sprites are too large, the ship silhouettes are basic, and the sound effects sound hollow. It just isn't my cup of tea.
Truxton's absurdly difficult and punishing, but it's such an amazing game... I've been playing it recently since it's my most recent Genesis shmup pickup, and I really love it, even if I hate it half of the time because of how hard it is.

The graphics and sound are great for a 1989 Genesis game; this is one of the best looking, and playing, games from the Genesis's first year, I think. It probably doesn't quite match R-Type or Blazing Lazers on the Turbografx (both 1989 releases), but still, it's very good. The first year was fairly weak, sure (there's Truxton, Ghouls & Ghosts, and not a lot else I really like...), but still, it is good for an early release, certainly. The "die once and it's just about game over" design is frustrating, but it's a pure memorizer, and isn't quite R-Type hard I think. Hopefully I'll eventually get through Truxton.
I've played a bit of the arcade/FM Towns/FM Towns Marty-only sequel, Truxton 2/Tatsujin-Oh, too. It's even better, and even harder, than the first one... amazing soundtrack though! The first game sounds good on Genesis, but the second one's so much better. It's really too bad that the FM Towns computer had the only home port.
It's been a loooooong time since I've played MUSHA, but I do like it over Robo Aleste and Space Megaforce. Aesthetically, I don't like the color palettes used for the latter two; Aleste is very drab, while Megaforce looks too consistently silver/gray/mechanical for my tastes.
A lot of people seem to feel that way, but I think tht MUSHA is a bit overrated, compared to the other 4th-gen Compile shmups. It's a great game... but all of their 4th gen shmups are, and it's not nearly my favorite one of theirs that generation.
I agree about Android Assault: it's uninspired, but it's solid and I do have fun with it. I have a hard time enjoying Sol-Feace/Deace because the enemy/ship designs just fall flat with me.
I think I actually like Sol-Feace more than Android Assault. Still, both are alright, decently fun games, but not as amazing as the Sega CD's top three.
Forgotten Worlds is one of my most favorite shmups! I like virtually everything about it: 360-degree firing (great use of the 3-button pad to mimic the arcade's rotary dial), bright & colorful graphics, 2-player co-op, imaginative stages (vertical, horizontal, and diagonal scrolling), varied bosses, and great music. It's much easier than the arcade, but I don't mind. (I also have the Master System and TurboGrafx-CD versions.)
The Turbo Super CD version absolutely blows away the Genesis version. The one and only advantage the Genesis version has is that it has a real two player mode; otherwise, there's really no reason to touch it. Well, it also has more parallax, but still, the TGCD version looks a lot nicer. I do actually prefer Sidearms (sort of Forgotten Worlds' predecessor) to Forgotten World, but at least on Turbo CD Forgotten Worlds is better than the somewhat ugly, very early Genesis release.
And I think I remember liking Twin Cobra over Fire Shark.
Twin Cobra has better graphics, but the graphics are too large, and the game is too hard. Also, I much prefer Fire Shark's style; Twin Cobra is a sequel to Tiger-Heli (NES/Arcade), which I also have somewhat negative feelings about, while Fire Shark is a sequel to Sky Shark (NES/Arcade), which I think is much more fun. The sequels have a similar quality gap.
Also, how could you like Twin Cobra but dislike Truxton? That makes no sense! Well, I guess Truxton is a bit more like Fire Shark than Twin Cobra, but still...