" If you ever just get a scythe and then you are like going around and you are like I'm going to hack at things and stuff like that. It totally does not work. I mean there is just this tiny bit of knowledge that you need to make it really sing for you." -Paul Wheaton
A scythe has become one of my favorite trimming devices (second only to goats). Whatever the type, it must be sharp. Typically the blade requires touch-ups during use. (Minor comment - I didn't think not all blades should be 'peened'.)
In addition, to sharpness, proper technique helps tremendously (I am still learning). Even with my beginners technique, it mowes surprisingly fast.
The sound is much better than the powered variety.
Mine is extra special since it is one my Grandfather used! (It had been stored in the garages of my parents for 15+ years and then my own garage for another 15+ years until I actually tried to properly use it. I am so glad I kept and finally put it to use.