No doubt about the quality of these pens or their life-long guarantee/service. My old pen lost its spring, but the Danish distributor replaced it for free. As I find my smart phone a bit difficult to type on now and then, I decided I wanted to try this pen with stylus. It does not quite do the job, but I rather fear the screen of my smart phone is to blame rather than the pen. Writing with this pen is as always a pleasure. My only problem really is with the clip, which always seem to be in the way.