Seems like it would be a good force multiplier for initial assaults, SOF, advance teams, and so forth. Obvious advantage is lighter weight and one man pack, but I also think the speed of deployment would be a big advantage. Imagine laying accurate indirect fire on a 500m target as the helocopter is lifting off after the insertion. That would be very fast and help helo survivability, IMO.
Agreed that 1000m is a big trade off at 1/3 the range of a crew served 60mm, but the speed of deployment, portability, and potential for multiple tubes at the same overall weight could really improve the mobility and firepower of smaller elements in many situations.