I have bought Phillips QT 4006/15 pro skin advance trimmer last year. I want to share my experience here.
As per my opinion please dont buy this product.
It takes almost 8-9 hours to charge and then it will give you 40 minutes service . After charging this much long time it performs only 40 minutes and if your charge is ended in between you shaving then you have to charge it again for 8 hours.
It has no Battery indicator by which you can know how much charge is left in the trimmer.
There is a red light in the trimmer charger to show it is charging thats all.
It is user friendly but many times you have to remove the cover to get a perfect shave.
This is a value for money product But I will not suggest you this because of the charging problem. If someone suggest me before like I am suggesting you then I will not buy this product.