(From the CNCookbook website) What is G-Wizard? Get Feeds and Speeds in seconds Getting good Feeds and Speeds is quick and easy: Fill in the blanks left to right, top to bottom and G-Wizard instantly returns the best feeds and speeds. Super simple for Beginners, powerful and flexible for Pros. Plus, the best training materials anywhere free with the product. Figure the Best Cut Width and Cut Depth How do you know when you've got the best Cut Depth and Cut Width? These two parameters matter more than almost any other for best feeds and speeds. G-Wizard will find the best combination to keep tool deflection under control while maximizing Material Removal Rate. No other software can. Adjusts to Your Needs Are you looking to maximize tool life or material removal rates? Do you have a small CNC machine or a big industrial machine? Are you trying to hog out a bunch of chips or achieve the best possible surface finish? G-Wizard makes it easy to dial in exactly the results you are looking for. (From me ) The group buy would be for an unlimited 3 years subscription which will be limited to 3HP spindles afterwards (I don't get why) edit: There's the answer they gave me: "This is how I get the product to hobbyists at a price they can afford and to professionals at a price that's fair given the value the software brings them." Which is totally honest. The prices would drop the more we are: Bought alone $129 2 licences $239 ($119.50 each) 3 licences $329 ($109.66 each) 5 licences $459 ($91.80 each) 10 licences $839 ($83.90 each) We might even have lower prices if we are more!