Would be interesting to see a side by side comparison of results surveying the same structure from the various devices on the market for this type of work.
Spec sheet on the emesent has it as 30mm accuracy and 300k points per second. Similar spec to Zeb horizon and like the Zeb, useable hand held and with other mountings. Blk2Fly is listed as faster and more accurate (20mm and 470k points per second) in their
spec sheet but is reported as having very short flight times and doesn't offer the flexibility of doubling up as hand-held or vehicle mounted.