It sure is a top eyepiece Rod . It was our first premium EP purchase to use with our 12" Dob. We can highly recommend the Nagler 17mm it has a super FOV in the 12" and used with a good filter the contrast and clarity observing nebulae is amazing
We also have a 10mm and 7mm Pentax XW but must say the 17mm is the favourite.
D&B