My Dad was fond of saying "If you buy cheap stuff, you will pay for it twice .... the 2nd time after it fails". This maxim was always quoted when tools were to be purchased.
When one has upwards of $7K in one of these Nortons, do not cheapen the product with an inexpensive knockoff. There are some exceptions, e.g., JCC pistons, which are so cheap, it is hard to believe they are good.
Besides all that, you will always enjoy quality. Treat yourself to it ..... if you don't, who will?
The twist grip is the interface between your heart and the soul of the Norton ..... go for the best!
Slick