Using trimmers from last 1 year but my quest finally ended with this Philips QT4000 trimmer.
The main advantage which I personally likes the most is its portable nature, as the trimmer is a cordless one and you need to charge it with the charger came in the box. We can use it anywhere without worrying about electricity. In one charge it trims your beard 10 to 15 times(Depends on use).
The trimmer has 10 trim settings provided in it, using which we can choose the hair length we want to maintain. It is 1mm to 10mm which is not bad for a person who need a trimmer for trimming purpose only:)
and as the product is from a trusted company Philips it comes with 2 year warranty which is available at Philips service center( you can easily locate one in every city). so you can buy it without any second thought as per my experience.