MSR fuel pump
I have used the Whisperlite system for a few years now & find it a really efficient cooker, which takes little time to boil water.
This new pump is a great improvement over the old one; which was fairly brittle & needed some care so as not to damage it - that's why I needed to buy a new one!
I feel much more confident that it won't break when being vigourously pumped to build up the pressure. The only concern is that the handle used to adjust the fuel flow is too long to enable the locking clamp on the cooker to be engaged properly, but this hasn't proved to be an issue so far.
In all, MSR have re-engineered the pump to make it more robust - exactly what you need when lugging around a lot of gear in your in your rucksack.