Although Philips is known for making the best trimmers in the market currently, the qt4005 is not that impressive according to its price. It takes 10 hours to recharge its battery and then it only lasts for about 1-1.5 hour. Also the trimmer cannot be used while charging which is again a huge disappointment for me. The noise of the trimmer is also irritating and it does heats up while used for more than 5 minutes continuously.
The blades are not titanium plated so it sometimes hurts when I press the trimmer even slightly on my skin.
I would suggest if you a Philips trimmer then go for the qt4011 model which has titanium blades and also it has a 1 hour recharge time.