Hi John,
Using 2" pipe straight through is near on impossible in most households, you will need a 1.5" whip at some stage. 2" is impossible to manouver especially around tight corners.
Some tm'ers use straight through 2" wands, great on straght runs, not on tricky stairwells and tight corners!
Use what you feel works for you, I'm prefering using a whip on stairs and tight corners, 2" on runs.
All te best,
jason.