My Navigator finally died and the Stratos was my choice to replace it.  Love so many of the updates.  The roller.  The dirt cup and HOW it empties!  The cord length.  These all sound like little things but to me they really aren't!  
The only negative update I've found is the light is gone on the wand.  That light made vacuuming dark corners so easy, why did they leave it off the Stratos?   
Yes it's pricey, but if you use it daily like I do, it's worth it!