I have one Campy 11speed bike. It came on a bike that I bought used and I going to sell the group and put 10 speed on, but my wife convinced me to keep it. It’s fine and I like it but I would not pay a premium for it. The FD was a pain to get dialed in properly. Nice thing about 10 and 11speeds is the availability of compact cranks. I still really like my Campy 8 speed Ergo groups for overall performance, reliability and ease of maintenance.
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N = '96 Colnago C40, '04 Wilier Alpe D'Huez, '10 Colnago EPS, '85 Merckx Pro, '89 Merckx Century, '86 Tommasini Professional, '04 Teschner Aero FX Pro, '05 Alan Carbon Cross, '86 De Rosa Professional, '95 Gios Compact Pro, '95 Carrera Zeus, ‘81 Masi Gran Criterium, ‘81 Merckx Pro, ‘89 Cinelli Supercorsa, ‘83 Bianchi Specialissima, ‘VO Randonneur, Ritchey Breakaway Steel, Rivendell Rambouillet, Heron Randonneur, ‘92 Ciöcc Columbus EL