The whole system has its ups and downs. If you need to bag and have trees, it's really the only way to go. If you can trailer something, a trac-vac may work better for you.
Mounting it can be a pain, but it comes with the package. What are you going to do.
I use mine every time I mow. I suck up so many leaves it isn't funny. It gets clogged if there is a stick in the pile, but otherwise, it performs pretty well.
Can't say I'm "overwhelmed with its greatness", but it sure beats raking.