I run the Husky 570 which is the same basic machine as your 7500's, and it is far more comfortable than the BR600. I sold my 600 (which was like new) because I always had to re-adjust the darn thing on my shoulders. I never have that problem with the Husky. The Husky's shoulder harness is much better in design and use than the Stihl or the 7500's. I have run every major brand big BP in the last few years, so I'm not talking without experience here. I run my blowers almost exclusively for leaves in the fall, and I wear mine for the whole day too. The 600 was better on fuel, but the power of the 570 more than made up for the added fuel use. Aside from the shoulder harness and the fact that my 570 is a lot more blower than my 600 was, I like the 600 overall, and if it had a shoulder harness system like the Husky, I'd buy another one.