The Spectro is the more stylised specs of the two designs with a stepped-up top line and dramatically deep pointed lower edge extending down your nose. The pointed shape gets vents on the lower edge and two more on the brows for enough airflow to fight fogging despite the deep coverage. The upper extension of the lens means no gap across the top if you're down in a tuck descending. The deep frame/arm junction is intrusive if you're glancing sideways in traffic/your riding group though.
Otherwise, the clarity of the Zeiss lenses is absolutely excellent, reducing glare without polarising so much they mess with LCD computer/GPS screens. The 'Super Bronze' lens we tested was a dark 12% VLT best suited to a bright day with no dark sections. The 5 lens range only tops out at 23% VLT too so the Spectros are definitely sunglasses not everyday specs unless you live somewhere we'd be deeply jealous of here in the UK.
The 3D shaped arms with elastomer strips over the ears give a firm hold on the head though and the adjustable nose pieces click between two positions to alter how far they sit off your face. That keeps them stable and comfortable despite a relatively high weight.