I had the Progressive unit and it was really good. I would say it is a solid choice.
The Greenlee branded toner is the same as the Progressive that can be found on amazon.com, just for reference.

I am currently using a Fluke Pro3000. It is not the nicer Pro 200 like Sam has but it costs less than 1/2 the price. It costs about the same as the Progressive.
I love Fluke but I have to say it is not as nice as the Progressive. And it has the issue of draining the 9v battery, even when the unit is off. I have to replace the 9v every month, no matter how much I use it (if at all). So now I leave the screw out and disconnect the 9v when I'm not using it.
I am looking at replacing it with either the Pro 200 or get another Progressive toner.