It doesn't make much sense to buy a $70 tool when you can get most derailleur hangars for around $20 here in the US and buy them from overseas vendors for under $6 if you are lucky enough to be able to track down the hangar number for your existing hangar. I bent one a couple of years ago and paid $20 including 3 day shipping from an online bike shop. I did know that it was a number 45 hangar. If I thought I might bend it a second time I would go to an overseas vendor on eBay and buy a spare. It was the only time I ever replaced one.
60 different hangars for $5.50 including shipping
https://www.ebay.com/itm/1PCS-MTB-Mo...PxxAj9y_xZlf-w