@Barkslip, @fruitnut, @txpanhandle1, You guys convinced me to get this tool. I purchased mine from aliexpress for $21.50 - $4 for being my first aliexpress purchase. So a total of $17.50. Less than half the cost of my grafting knife!
I hope it works well!
@Barkslip, do the blades from this fit your topgrafter? Might be a very cheap way to replace blades if they do.