Did I say the that Powerplus and others based on the Senior had less performance, JM? No. Don't add words to the topic please unless I've directly said it.
In terms of the Senior - I must point out one thing I forgot to mention - the hood though tall was enough to get under my parents bed for cleaning whereas the Powerplus got stuck. Where the Powerplus excelled was better edge cleaning - Hoover evidently improved on that design along with the redesigned Hoover Junior U1104. I might source out another U1104 at one point if I can get one - those ones are super machines IMHO.
