Mike, and others so interested- If you are asking about a specific grafting tool, I purchased one through Hummert- a foot operated benchtop model (I cannot pull the brand at the moment, but it is manufactured in New Zealand). This is a v cut type, and does it cleanly and offers replacement blades. It was pricey- like 700 + pricey, but thought it would make things a whole lot quicker. Here's the skinny, I wind up grafting most by hand anyway, as I am faster at it, and can be far more precise. Additionally, for anyone working with thinner wood, which can often be the case, most of these machines simply will not work, being hard to cut evenly and often mushing up the works. I like them for meaty stuff like 3/8 + pear stock or grapes. Although I quite like uber-simple machines like this, the price did not reflect the small amount of manufacture involved, replacement blades were costly, and instructions were awful. Lastly, both these v cut types and the tenoned units in my opinion do little to provide a joint with good structural integrity while healing. A whip and tongue, or simply an inch long whip graft with strong tape provide a much tougher product. A 15.00 grafting knife works just as well as most of these tools, and with just a little practice anyone should be able to bang out a thousand baby trees in a week. Another trick I have always used is to clean up any concave cuts with a good chisel for straight whip grafts (a holdover from my cabinetry days).
As far as speed, I cannot say enough about having your space fine tuned. Everything organized, stock in reach, a nice table and a comfy chair can shave more time that the best of instruments. And for anything that will take such time, have ready the best music you can lay your hands on.
Walden Heights Nursery & OrchardZone 3 in Vermont