Long story short - commercial treadmills are, in most cases, worth every cent they cost. But really question is, are they actually needed for home use or they are overkill?

If you do need a treadmill which is going to be used every day for several hours, if you do need treadmill with various walking/running programs, with automatic incline change, with heart rate programs, with high belt speed, etc. then YES, you do need a large and sturdy treadmill designed and built for commercial use. And if you do buy such treadmill and you don't use it regularly, it is, sorry to say, waste of money.

Choosing a right treadmill can be confusing thing to do, but when you decide on what kind of treadmill you need, and how much you plan on spending, things can get much simpler...