I received the Bionaire Steam mop as a Christmas gift from my mother in law (a VERY discerning shopper!!) and I love it! Being able to wash my floors, steam area carpets, and steam/sanitize areas is perfect!
The detachable hand held unit is not heavy, but can be cumbersome depending on where you are cleaning. It heats up rapidly and allows you to cover a large surface without having to refill the unit.
The microfibre cloth for the floor does not leave any streaks and truly shows you how dirty a floor is when it appears clean! The unit comes with two floor cloths and if you are like me, a replacement can be made with relative ease --although these look like they will last a long time! They wash up very nicely in the washing machine (just don't wash with fabrics that tend to shed fibres as the cloth will pick them up in the wash).
The plastic attachment/storage piece for use on area carpets is great in its versatility--keeps your mop off the floor to keep cloth clean, and glides easily over carpets to gently steam them.
The handle is telescopic and made of metal which will attest to the possible longevity of the appliance. This also allows comfortable movement in conjunction with the swivel base to go around corners.

The ONLY disadvantage is the lack of a brush attachment for the handheld unit, it would make cleaning around sinks and corners much easier.

Overall, I would recommend spending the little extra on this unit.