I think your right Wavy,
Definetly a specialised eyepiece .
I thought I would give it a try for my Fsq 85edx mainly.
Flat field, not over the top magnification and decent eye relief. -F5.3 = 187x mag
Barlows introduce to much glass in the equation (dim the view)
Only really useful on moon, double stars and planets though.
Doesn't hurt to try!
I think it ticks all the boxes for this scope.