Unfortunately, I own one. You'll come to know why I say "unfortunately" soon enough. I bought it new, and the grass fill level indicator never made any attempt to work. It wasn't a big deal to me - not worth taking the machine in for an attempted repair. The only other person I know who has a Yard Bug says his indicator never worked either.

Thanks, Thats what I figured. I'm just going to sell mine. You mind if I ask what you paid new?

New, about 10 years ago was around $1,200. Not a very good investment.

The "Grass Fill Level Indicator" is a yellow ping pong ball. However, you may use a white ping pong ball if you desire. The ball floats on a stream of air until the grass bin is full and then it settles down into the gromet located on top of the bin. There is a small window on the bug cover just in front of the seat to view the ball.

It's a very simple system and works very well.