Hi Bo, I'm sure someone will take you up on your offer. I've got the Skywatcher equivalent of your eyepiece; I haven't directly compared it to other eyepieces but it is a very decent eyepiece that performs well in fast or slow scopes. Any aberrations you see at the edge of field are likely from your scope rather than the eyepiece, with standard SCT's having strong field curvature combined with coma.
You would likely get slightly better contrast from high priced Pentaxes or Televues, but the differences are fairly small and not likely to be appreciated until you've been in the hobby long enough to get really fussy about your gear
