First off, let me say that I have owned Mighty Mites for over 15 years.  I've loved them.  My first one lasted for 12 years and was a workhorse.  My second lasted only 3 years but that was because my child broke a wheel off of it (long story).  So when I had to find a replacement, I immediately just looked for another Mighty Mite.  Didn't even shop around.