Fuji Velvia 100 is a the Ferrari of films. It has a punch. Have you ever marveled at a large color print where the tones are vibrant, the detail is incredible and it looks as if you were standing where the actual image was taken? There's a good chance it was taken with Fuji Velvia 100. It is the preferred film of professional landscape photographers.
Velvia is a slide film. In general, slide film, or color reversal film has a rich, quality that gives images a depth that's hard to produce with color negative film or digital images. It renders colors so vividly that they seem to jump out at you from off the screen. Velvia colors are the most vibrant of any film in existence today. Its colors and contrast commands attention, more so than the actual subject of the image. That's a positive or negative depending on the look and feel you're trying to capture. If you're looking for a film with the same richness, but more subdued colors, try Fuji Provia. You can read about Provia here.
I find the 100 film speed too slow for general purpose photography, even when I use it with a wide open aperture (f/1.4). On bright, sunny days I have no issue with this film, but with overcast and low light situations, forget it. Over half of my images come out blurry. This film is best used with a tripod.
Fuji Velvia is truly in a league of its own. Digital sensors just come close to the quality of this film. So, grab a roll of Fuji Velvia and give it a try, I think you'll be pleased with the results.
If interested, you can read about the types of film here, including slide film.