You would expect 56mm objectives to give you a bright, sharp, high contrast view, and the RFPros deliver. Optically they also have exceptional eye relief and field of view. It is their other features, however, that will sell these glasses. They go beyond waterproofness. The inside has been pumped full of dry nitrogen gas to prevent any chance of internal moisture fogging the view.
Construction seems to be on the rugged side.
The rubber armor is impressively heavy. These are compacts any birder could be happy to hold. For 25mm objectives, the SPros are exceptionally bright, exceptionally contrasty, and exceptionally sharp. With excellent eye relief and close focus, they equal the optical performance of many full sized glasses. The only drawback is a somewhat limited field of view for an 8x glass.