I think gar has the horsepower thing correct. If you want to check go to the Haas website and then to the Answer Man archives. There was a question and answer about this a couple of years ago.

As far as I can recall the hp on the machine is the 150% load, the border between yellow and red on the spindle load display and this can be used for up to 30minutes, anything above is limited to 10 minutes and 100% can be used indefinitely.

It seems to me that many people have the perception that Haas machines are underpowered and I think this arises because so many of their lower cost units have a simple direct belt drive. A direct drive machine running at 3000 rpm will appear to be grossly underpowered compared to a gearbox machine running 3000 rpm in low gear.

The answer is if you want to use hefty cuts and feeds spring the extra dollars and get a gearbox machine.