I bought my Rowenta in November 2012 and was impressed yet in February 2013. After about 15 months, I imagine unfortunately found that the suction extreme! has subsided. This really is a difference like night and day. I would buy no more battery operated vacuum cleaner for this price. The "low" variants hold times at least as long.
Supplement: The Notice of another buyer, the filter time to clean properly, was very good indeed. The filter can be seen namely first on no gross contamination. I have the filter washed properly, dried and used again. The suction power has again improved dramatically.