I gave the eyepiece a test last night. It performs better in the F8 than the F4.7 as expected, but still quite nice. In the F4.7 stars begin to flare at about 70% out, but crisp in the centre. Which is fine as I place most objects in the middle anyway. In the F8 it starts about 90% out.
Overall I'm quite happy. For the price of it it's delivers a nice crisp image and is easy to look through
Everything I need it to do.