Keiser M3i update and Zwift

I would like to be sure that Keiser M3i with Converter is working 100% on Zwift, with 100% I mean the variable resistance, which gives the impression of riding in the real world whereby the bike “recognizes” ascents, planes or descents and thus makes the driver to shift gears

The M3i doesn’t have that feature in any form, with or without Zwift, so no, of course it doesn’t support that. It’s a one-way Bluetooth watt meter collection device. Check out M3i Indoor Bike | The Ultimate Indoor Cycling Machine | Keiser to learn more about what the M3i can and can’t do.

I’m sending back M3i, would you be so kind to reccomend some smart/spinning bike model able to use full potential of Zwift

Sure. https://www.velonews.com/gear/best-smartbikes-for-zwift-a-four-way-group-test/ and Smart Bike Shootout: Wahoo KICKR Bike vs Tacx NEO Bike vs Wattbike Atom | DC Rainmaker (2019) are good comparisons of your choices.

What You Need To Ride has a full list. If you don’t want a smart trainer device and instead want a full indoor bike, scroll down to “Indoor bikes” and look for one that has a check under “Controlled Resistance.”

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Asking $200 is just not good enough. Now I know why there are loads of Keiser M3i available on eBay!