The anime version stopped after 12 episodes and had an English dub which have pretty awful voice acting. The manga, however, is still ongoing and has a very interesting storyline.
Two live action movies were made in the US. The first starred Mark Hamill (yes, the same guy who played Luke Skywalker in Star Wars) and was pretty cool if a bit on the cheesey side. The second had a much smaller budget and felt like a long, drawn out Power Rangers episode. Both don't really seem to follow the main storyline in the manga so much.
The Guyver would of been a decent franchise if only a company like Marvel would buy the rights to it and create a comic book.
2. If I was a guyver, I would kill all my enemies and take over the world!