Hi there and welcome to the vintage Digital SLR forum!
There are better forums to discuss old(er) Nikon film bodies, but I'm a long time F4 user myself, so I'll try to answer your question.
There are mixed opinions about the F4 (as with other models), but I personally think it's one of the "best" Nikon cameras ever made. I used the F4 professionally for several years, and it never let me down. Being a professional camera, it's obviously very robust and reliable. Like other F bodies, it's built like a tank. Its autofocus is relatively slow compared to later models, but unless you shoot fast action/sports it's hardly an issue (I mostly used manual focus lenses with mine).
Compared to a digital SLR, like the D200, you'll be amazed to see the large viewfinder image. Impressive.
One of the best online sources of information (both for the F4 and most other Nikon equipment) is the excellent Photography in Malaysia website:
http://www.mir.com.my/rb/photography/ha ... /index.htm
In the digital age, you can now get F4 bodies for ridiculous low prices. Considering value for money it's probably one of the best cameras you can buy today. Just make sure that you get a nice, preferably amateur-used body. Good luck!
To get this thread back on topic, did you know that NASA made a special, highly customized digital F4 version? More info: http://www.nikonweb.com/nasaf4/