I was planning on purchasing a Mini for use around the house, but I found a CT26 at a price too low to pass. For folks that own the CT26, did you purchase the optional handle for going up and down stairs or do you just use the built in handle on top of the unit? I took it up 3 flights of stairs today, but I had to carry the systainers with my other hand. If I had the optional handle, I'm wondering how easy it would be to load the systainers on top of the vacuum and use the vacuum like a dolley to go up and down stairs.