Parallax rings are well designed and securely hold the FS-128 that I bought them for. My only complaint is the finish is pretty rough for the price. Repainting them with several coats of Takahashi green makes a big difference.
This updated version of Stellarvues 9x50 finder scope with its rotating back makes it the perfect finder. As you all know, the eyepiece of your finder can get you into some strange positions as you move around the sky, having the ability to rotate the eyepiece is just what the doctor ordered. I dont think theres another finder on the market that can compare with this one for the money.