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They are brilliant for controlled efforts. So whatever intervals you want really.
For me controlling resistance by simply shifting into a higher gear seems the best. I don't want any other features. I have trainer road which will display my wattage, cadence etc. on my laptop via the sensors I already have on my bike. So I can do all the training vids etc.
That said I have 3 resistance curves on mine. Which allowed me to hit sweetspot at 85 rpm on the fixed gear. So some adjustability has been handy.
I still hate it though.
I've just bought a house, and need all new white goods. But all I can focus on is a replacement for my horrible turbo when I set p the new training space.
My super magneto pro kills my legs.
There'll be a few factors at play there though.
To be honest that Jetblack looks good for the money.