Previously I was using anoother trimmer but The Philips QT4000/15 Beard Trimmer is 100 times better then that one. The blade qualityof the QT4000/15 is awesome. Even you can trim already trimmed beard with it, it is sharp.
The one thing which could be disappointed you is the charging time of 10 hours taken by it. But once you cahrged it fully, you can easily use it twice. For the charging problem, you can go upper model of it like QT4011 and others.Overall, it is a good product to buy.