I have and have used both Hewes and Kindermann, and think they are both excellent. I use the Kindermann now, because I got tired of ruining frames on 120 film from improper loading, and purchased a Kindermann loader. Loading reels is now much less stressful and more reliable.
Apparently, Murphy was also a photographer. His law always seems to come into play by ruining the most valuable frame on the roll! The Kindermann loader levels the playing field a bit.