Aside from the cosmetic differences between the Eclipse and the Behemoth, they are generally same-featured mice. They both feature double-lasers, on-the-fly DPI switching, adjustable weights, multiple profiles, and high precision. Full specifications, from the OCZ website, are:
Our review of the Eclipse showed very positive results, with the exception of the high center of mass of the mouse and the poorly designed software. Will the Behemoth succeed where the Eclipse did not? Continue on as we find out.