I own a rotring 600 which my father used 40 years ago - indestructable. However my Pentel GraphGear 1000 is so much better: metal body, rectractable tip (so I can carry it in my pocket), great grip, great balance.
Rotring also makes a version of the 600 with a plastic body: the Rotring 500. It has the same excellent mechanism and very similar grip, and it's lighter, which some people prefer. It's also less than half the price. It's my favorite mechanical pencil.
I'm still using the same (cheap) Pentel P205 pencils that I got in university in 1989. I've bought lots of different pencils over the years of all different price ranges and I always come back the pencil I have the most history with.
Try the Rotring 800. It's all of those things. It's a bit more expensive than the Pentel, but if you're not prone to losing pencils, I think you'll like it.
They're well-built, stylish, and incredibly durable. They do not look or feel cheap, and they're perfectly weighted.
After years of experimenting with different models and refills, I've found the one brand I'll stick with forever.
Do yourself a favor and look them up.