From what a friend tells me that works on commercial infrared systems, thermopile sensors like used in the Seek are not nearly as good as microbolometer. The only advantage is they dont need a NUC. Well, that and they are cheaper.
For those looking at the 25 degrees FOV that is a pretty tight FOV. I have a couple DRS cameras in 320x240 and 640x480 and to get an idea what 25 degrees is at about 4" from the camera I can see about a 4" circle. It is pretty tight, good for UAVs.