The best kind of stripper, for maintaining the integrity of the wire (avoiding nicking) is a thermal stripper. But it's messy and stinky, and you have little curls of melted plastic to trim off. For mechanical stripping, the Ideal Stripmaster is good if you know how to use it properly. I wouldn't touch the harbor freight knock-offs with a three meter pole, but I am a former 2M tech and my personal solder station is a Pace PRC 2000, which is sort of the Snap-On of portable rework tools. Yes, fancy strippers are great, as are nice comfy $50 diagonal cutters, especially if you are going to be using them all day long. Buy the best you can afford, take care of them, and your hands will thank you.
Good tools are always nice, and I never feel bad spending extra money to get good quality.