Disadvantages: You will wonder why you never had one before.
BR600 is good and very popular, but do know, the valves will have to be adjusted over the life of the unit due to the way it is made. Adjustments are based upon how much use it gets. If you are a mechnic kind of person and feel OK tearing into your motor, you can do it yourself. If not, it will need to go to the shop to do it.
I did not want to mess with it, so I looked at the Echo 770 & Husqvarna 570 BTS. Went with the Husqy as I wanted the most power I could get for my personal use for fall cleanup. The 2 Husqy units (570 & 580) will out blow anything else made.