Cyclone Dust Bin Sensors-What brand/product are you using?

I have an Oneida brand sensor:
http://www.oneida-air.com/inventoryD.asp?item_no=AXB999110A&CatId={4CA9A078-61CB-463F-B843-8C681E38534F}

Upside is that it works, downside is that it is $150. It also “senses” swirling dust in the bin and flashes sometimes before the bin is full, which is annoying, but overall it has kept me from packing my filters full of dust and chips which, after you do it once and then spend an evening trying to blow out the filters, you never want to do again.

-- Rob, Sault Ste. Marie, Ontario