Best Field GIS that I have found.

first off...the ability to add spatial data to the device is huge. not being dependant upon wifi or 3g connectivity makes data collection in rural areas possible. project set-up is much more intuitive and quicker than any of the ArcMobile products (including their iOS application). While there are some features still lacking, field data collection is not possible without project se-up being too taxing on my limited time.

Mr_McD about iGIS