I've had the HRR since 2015 (this is my fourth season with it) and it has been awesome. The cut quality is amazing and it mulches really well. I love the variable self-propelling system because I walk really fast and it goes with me.
The only minor issue I have to solve this weekend is cleaning out the back wheel gears, since there is a lot of resistance when I back up. I think the gears aren't fully disengaging due to dirt/grass build up. I did renovate my lawn last fall, so the scalping probably is the culprit.
My dad has a Toro Recycler from ~10 years ago and it still runs great. His has a Briggs and Stratton engine. The Toro are definitely inferior to the Hondas when it comes to mulching, and I don't love Personal Pace (it doesn't go fast enough for me). One plus to the Toros are the B&S engines don't need oil changes
Ultimately, the HRR may not be good for a lawn care business, I don't know. I'm only mowing 1-2 times per week, not every day. The HRR is the little brother to the HRX, which is widely considered the best homeowner rotary mower. They share the same blade/mulching system, and the Honda name.
At the end of the day, both the HRR and the Recycler are solid mowers that each have pros and cons. And the power to choose is yours.