22 kg for the maxi .... 28 kg for the express ..
The maxi splits in two or something so may suit , depending on the car and what your wife is willing to carry .
There is nothing ' wrong ' with the maxi , it says it now features a single vac motor with the power of two .. ( 1600w two stage ) chances are thats an ametek 7.2 or a slight chance the 6.6 , although im sure they'd be shouting about if if it was ....
anyway , i means it has the power of two low powered vacs , cause no matter how you add it up neither comes close to two 5.7 three stages .
The express is a superior machine , but its up to you on the practical / weight side .