They are pretty good as well as consistent, you can get the 3 way cutter for it and do all the trimming at once.
As far as your other question in regards to manual trimmers I would go the automated route, less wear and tear on your arms. if you look at the other hand operated trimmers they all have an adapter for some sort of drill.
The next level up would be a Giraurd trimmer but at 500 something why bother when you already have a good trimmer, especially one given to you by your father
Memo
