Rob I’ve used the Kickr Snap on Zwift for a few years without any real problems. I rode a couple days ago for the first time in about a year (mild winter last year and never had to ride indoors!) and did a quick spin down and was up and running no problem. The app looks to have changed some and the spin down isn’t as complex but I’d go through that again. I use a Tacx trainer tire at 120 psi and tighten down 1.5 turns of the knob past first contact roller with tire. I think the owners manual recommends 2 turns but that always seemed too tight to me. Anyway the resistance seems pretty reliable and realistic to me. Zwift and smart trainer really changed indoor riding for me. I still don’t ride indoors much but I enjoy it more and ride harder when I do. With a dumb trainer I would have to be really desperate to ride indoors. I have a set of rollers that I tried twice before deciding I’m too old to learn a new trick like that.
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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, '82 Colnago Super, '95 Gios Compact Pro, '95 Carrera Zeus, '84 Basso Gap, ‘89 Cinelli Supercorsa, ‘83 Bianchi Specialissima, ‘VO Randonneur, Ritchey Breakaway Steel, '84 Paletti Super Prestige, Heron Randonneur