It is a user friendly product.i bought this product before 7 months.with this same brand.NOVA model NS-3909 trimmer. and now it is still working with a good condition.no damage.no problem.with in this trimmer.it has a fast charging so the waiting time was less.and this product is fully worth for money.and the performance of the trimmers was very good.very good effectiveness.it is easy handled.comfort design so handled can be very easy.so the overall review is also good.