Bottom line is they are saying that for about 1/2 the price of an efficient vacuum you can buy the Vacuette.  However it does not say that the Vacuette is actually as efficient as the more expensive vacuum but it comes across that way just by the wording.. So in other words even if it isn't as efficient or good as the more expensive one, they haven't actually told a lie. 

It's called ad-speak. Where they say something in such a way that you think you're getting something good or better when you're probably not.. 

Another example of this... are the many commercials that say things like: 

No other detergent  outperforms ours.    or

No other bleach outperforms Clorox Bleach.. 

which means

No other bleach outperforms Clorox bleach BUT Walmart Bleach can perform just as well (prolly costs less as well). It just doesn't "outperform" it