An Andrews 30mm UWA came bundled with a recent telescope purchase I made here on IIS. I gave it a whirl in my f/5 dob last night. I got a bit of a fright looking at the outer field, but the central field was quite nice and I think this eyepiece would make a very nice finder to accompany a medium magnification premium eyepiece. I often find that aberrations are only bothersome if you are looking for them, particularly with a very wide TFOV eyepiece such as this one. While scanning around I mostly looked at the central field with the outer field in my peripheral vision; if something of interest draws your attention it gets moved to centre field anyway. There is one of these avertised at
http://www.astrobuysell.com/au/ for $75.