Curious how you drill the weight hole? If the kit comes with 2 bits aren't you stuck buying another bit (or set of bits) if you want to use different sized balancing holes? Same thing will occur if your finger sizes are different.
Not trying to bash the tool....I suppose it could be useful. But having worked and owned a pro shop for years I think the tried and true tools are the way to go. There is a reason that those of us in the industry use them.
Personally, if I were to do something at home this is the way I would go
http://www.shop.innovativebowling.com/Starter-Pro-Shop-Package-PSP-Starter.htmEspecially since they offer great support to the industry. John is top notch when it comes to addressing issues and they offer financing. To have a decent home shop you will need other stuff such as a bevel sander, ball spinner, and hand tools. Some come with the package, others would need to be purchased. But you could have a better set up than some shops do for around $3000 for all brand new stuff.
Or hunt around and find used stuff. Again, not knocking the product, I just think there is a better way to do it.