I bought this to replace the QT4022 after the battery died. The QT4022 was far better for producing an even shave. The comb on this model fails to lift the hairs for cutting, and so anything below 3.5 or 4 leaves long hairs depending on their orientation, for example along my jaw line. I have persevered with this for months, but come to the conclusion there is no way I can use it to produce an even shave. I think it is probably due to the curl in my beard hairs, so maybe if you have straighter whiskers this will work.