Hi Jeremy,
That particular EP is not an optical match with Newtonians, and it will show astigmatism and field curvature when used in Newts. I have looked through one of these EPs in a couple of different f/ratio Newts - the visble aberrations are pretty much as noticeable/prominent as those seen through a 30mm GSO Superview. So the faster the focal ratio the more significant the aberrations are. This EP will be fine for some people with Newts, if you are able to tolerate the visible aberrations
Certainly an inexpensive option, but it WILL show aberrations in Newts.
The same EP in a refractor, SCT and Mak, the image is much better. Fast fracs do show some field curvature with this EP.
Alex.