You didn't specify what type of telescope you own, it would be helpful to the readers in order to determine performance.

I apologize, I was so taken by this eyepiece that I forgot to mention what telescope I was using. It actually a borowed TV-NP102

This eyepiece was compared extensively to a Meade Series 4000 UWA, a "cult" eyepiece.  I had owned the Meade for 10 years and had compared it with other similar eyepieces but never felt I would replace it.

Until this  eyepiece, that is.

The 13 had a wider field, sharper star images, less internal reflection, better light transmission, and was less expensive.

This is the sharpest and best eyepiece I have ever owned, and I have owned over 300 eyepieces.  It provides, with my scope, nearly optimum exit pupil and magnification.  I use a Paracorr in a 12.5" f/5 scope, so the sharp-to-the-edge images are partially due to cancellation of coma.

But, light transmission is good enough this is my galaxy hunting eyepiece, and there is not a trace of internal reflection when a bright star is outside the edge of the field.

I own 4 other Type 6 Naglers, and this one is the sharpest of the lot.  Star images are smaller and tighter in this eyepiece than in any of my 8 other Naglers.

Pros:

Affordable

Small and light (can be binoviewed)

Superb light transmission and baffling

Easy to use

Cons:

The rubber eyecup is only 8mm tall, but the eye relief is 12mm.  If you instinctively move your head forward until the eye socket touches the eyecup, you will get blackout.  You have to learn to hold your eye back a bit more.

Rating: 10 out of 10

I used this eyepiece with a 12.5" Obsession, providing 122X magnification. It gave excellent views of the Dumbell Nebula, when it was only ten dgrees above the horizon. Also gave exceptional views of Orion Nebula, as well as the M46 star cluster with its accompanying planetary nebula. I also used it on M84, M86 and the other Virgo galaxies in that area. I could see details on the edges of the brighter galaxies in Virgo and the Leo Triplets. As a previous reviewer noted, this eyepiece gives sharp, flat high-contrast images. Saturn was very distinct, revealing the Cassini Division, the shadow of the planet on the rings and the rings on the planet.

Rating: 9 out of 10