I have the 6mm and 15mm eyepieces in this line. I use them with my Skywatcher 8" dob, f/ratio 5.9.
I will qualify my review by acknowledging that, other than the stock eyepieces that came with the telescope, these are the only eyepieces I have used. Also, my observations were on the night of the harvest moon, so the viewing conditions were not optimal. Still, Jupiter, Saturn and Venus were so bright that a moon filter was needed to reduce the glare. I was also able to find Uranus and Neptune, and Mercury just before dawn.
The views through these eyepieces are breathtaking. Of the two eyepieces, the 15mm is a crisper but not by a lot. At 200X magnification, both Jupiter and Saturn were spectacular through the 6mm. Venus's crescent was well defined. The 68 degree fov is great. There is a little bit of blurring at the edges, but the object stays in the field of view for a lot longer than my stock eyepieces.
I am very happy I purchased these eyepieces and plan to purchase the 9mm soon, as I have heard from other reviewers that it is their favorite in the set. I highly recommend both the 6mm and 15mm eyepieces. As always, Astronomy Plus delivered both these items in perfect condition and in a timely manner.