I have five of them (two pairs for my binoviewer and a single 6mm) and I like them.
For single eye viewing I
slightly prefer the Pentax XL/XW and Tele Vue Delos (only tried the 6mm) eyepieces, all of which are more expensive than the Radians, but the Radians are still very good. The Radians are smaller and lighter than the Pentax and Delos oculars and IMHO work better in a binoviewer then their bigger competition.