I've had the multisharp for a few years now and bought it for on site sharpening because of its portability and the fact it was the only grinder that would do spade and brad point bits
So long as you don't force it and follow the instructions it does a far better job than I have ever been able to do free hand on a grinder.
I have had to true up the wheel a couple of times with a diamond tool and today (because I'm on crutches. Compo) I touched up all of my drill bits (54 of them) in my assorted size box .
Thanks for the tip James. I've been wondering what to do with my wifes old sewing machine
Don't force it, use a bigger hammer.
Timber is what you use. Wood is what you burn.