I'd never heard of pump toothpaste before moving to England, but now I love it! I'm currently using Aquafresh Multi-Action + Whitening pump toothpaste, and it's just grand. The toothpaste itself is the same as what you'd buy in the tube, which is minty, refreshing, and great for cleaning my teeth. It's supposed to be a whitening toothpaste, but I've never really found those to be that effective, or at least their effectiveness is not always very apparent.
This toothpaste is called multi-action because it's supposed to whiten, fight plaque (it contains fluoride!), and strengthens teeth. Now maybe I'm just a toothpaste amateur, but I've never found one toothpaste to actually DO that much more than another, but I am happy with this one because it tastes nice, keeps my breath minty, and cleans my teeth when I use it, which is pretty much all I need.
The best part about this one, though, is the pump! Instead of the frustration that comes from having to try and continually fold the tube up as it empties and then squeeze the last bits out, this toothpaste merely requires the pressing of a finger and it magically pushes toothpaste out. And it even stands up nicely on your counter.