I'm just wondering what the catch is with the Bluebird tow-behind aerator on the Alamia web site. I have been pricing these for about a month now and and the Ryan is about double in cost. Do these work as well? Will they work as well? Will they work behind a ZTR? And I'm assuming that the blue gas cans on top are for water? Thanks for any info. You can find this item at alamia.com.