I agree with everyone else, your money, your choice, maybe rent time on one first.
In my life I have had family members frown on our purchases, like when we bought the boat for skiing. That boat was a great purchase because for years our teenage daughters wanted to spend time with us on it and bring their friends! How many teenagers want to spend so much time with their parents and have so much fun doing it? Those same naysayers spent their disposable money on things we never would, never did: cigarettes, gambling on horse races, going on cruises. To each his own. Get your longarm if you want. They don't know your wants and needs better than you do.