We did a dual-band AP eval a while back, before the 1130s came out. Based on expected product longevity (we thought the 1000 series was likey to be end-of-lifed as a fallout of the Airespace acquisition) and keeping our antenna options open, we decided to go with the 1242s. The omni antennas add minimal cost. We haven't tried mixed antenna deployments yet, but based on more info such as Dennis has indicated, we may do so more aggressively in the future.
