I would place the order of those as ZEN ED first, Promaster second and Hawke third. The Hawke is last because it seems to have a common complaint of softness at the edge of the field. I have the ZEN ED and Promaster. Optically they are too close to call. The chief difference is the ZEN ED is a little slimmer because it has a littler thinner armor on the barrels and it has nicer eye cups. The ZEN also has a listed higher fov. The Promaster has both water an oil repellent coatings, while the ZEN does not. Both ZEN and Promaster have quite flat fields and little edge distortion. ZEN has the best price.
They really do seem to be 99% of the optical view for 25% or so of the price when compared to the alpha glass. But they are a new binocular and the companies marketing them are new, so the warranty, service, and repair issues are open questions.
There has to be something that comes from the extra money of the high end stuff. But the ZEN class looks and feels pretty solid and I for one don't have pause over what seems like a weak build or non serviceable design. They seem at least as well built and solid as the Vortex, Leupold, Nikon and other binoculars in that price class.
Alpha class glass makes more sense if you use your binocular a lot, need it to make your living, use it in extreme conditions, or if you have the tendency to always want the best "stuff". That last is not uncommon and probably sells a lot of "stuff".
Edited by Klamath - April/05/2009 at 09:57