60 meter range! Grass won't conceal a heat source, would be pretty evident. We've done testing and body heat could be seen through evergreen trees.
All 30 hz models are restricted from USA export due to ITAR. That being said the 9hz models aren't slow and choppy at all, they are quite functional.
Most weapon mounted thermals are around 25 degrees, it's not narrow really for weapon sights, the FOV on an ACOG is only 7 degrees for example.