I’m a big fan of the Bean 785 gun. You can change the tip oriface sizes to gain a little more height. And it looks cool.
I agree with JD that the JD-9 is good for shrubs or small trees (< 20 ft), but you won’t get much more than that out of it. NEVER give in to temptation and buy the “imitation” JD-9 to save $100. You’ll pay for it in frustration and down time trying to fix the damn thing. Always buy the real one.