Pros: fast, powerful, simple, efficient
This is the must have for the serious pumper. You can do both sides at same time. The powerful suction / pumping action is very effective and gets maximum milk in minimum time. It's a must have for anyone who does significant pumping. Not cheap, but for people who pump daily or work outside the home, it makes pumping about as painless as it can be. For me, worth every penny.
The parts that actually touch your breastmilk are external to the pump and can be replaced. Though the package says that this is a single user machine, my sister plans to use mine in the future and will only have to replace the external tubing, etc. They have a decent resale value.