Suitability of GR Research LGK 2.0 For FH Lite Or Other Designs?

Haven't gotten them yet. Just reaching out to see suitability before I plunk down $$. Of course the claim is "all full range drivers need a filter" The specs look pretty good in their cabinet design with their filter but, it's a bit pricey for drivers and XO parts and you're still left to build the cabinet.
 
As Dave notes, corner horns by way of innate characteristic do not experience the same losses as you would get in 1/2 space or free-space (in the event you listen suspended in the stratosphere) conditions. They further provide broader band gain than a regular box, in this case roughly up to the driver effective mass-corner. A rising HF response in the driver may require correction, but that is not the same causal mechanism as a transition from 4 to 2pi radiation space, and is unknown at this stage since GR don't seem to provide any frequency response or impedance data.