I think the cool thing about the strobe light was, that if you look at the blade when it's running, it appears to be standing still, and give a sharper image of where the teeth are cutting.
(Never tried a carvex myself, I was quite enthousiastic when it was annoounced, I liked that it was going to be lighter than the trion, because of the brushless motor; the cool strobelight, the toolless bladeguides, the exchangeable bases, the swiveling plug-it connector... but I decided to wait a bit, and it turned out to be not so great)
(after the introduction, the automatically adjusting bladeguide system didn't work well, so they "updated" it from the 400 to the 420 modelnumber, and put the bladeguidesystem from the trion on it, for which you need to use a tiny allen wrench)
I cannot speak from experience of it not cutting square, I use to have a trion, of which I was a bit underwhelmed given the lyrical reviews it got from everyone before I got it. (I didn't replace it after it got stolen