EcoDrake, any reason NOT to purchase?

I searched and read every EcoDrake post on this forum and found no bad reports and an average opinion of OK with this model. I am wondering if the Eco Drake non-ADH has any short comings that might steer me towards a better WaterSense certified toilet?

My community just offered a rebate for any WaterSense toilet and I am just looking for the best all around WaterSense toilet. Performance is most important but ease of installation is also a factor.

WaterSense list link.
http://www.epa.gov/watersense/pp/find_het.htm

WaterSense Toilets

There is no reason not to buy.

Jamie and I were at a demonstration of the new Eco toilets in Seattle with Brian Grumbles from the EPA.

Against the others, the Eco Drake looked very good.
Very good quality.

Terry said:

Against the others, the Eco Drake looked very good.
Very good quality.

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What other WaterSense toilets would make your short list besides the Eco Drake?

Thank you for your time and information. Pippin