Yes, if you're planning on doing your own maintenance for years to come it will pay for itself a few times over compared to taking it to a shop. Here's a good article that reviews a few other tools so you know what you're getting with the Park in comparison. The best derailleur hanger alignment tool: 9 tested - CyclingTips I've got one of the Park's Older verstions of the Dag 2.2, had it for over 20 years and maybe used 50 times on various bikes. It's bombproof and a little clunkier to use than the other higher $$ tools but no complaints for my uses and Park is very good in supplying parts and support.