Depends what you mean by cookability...
The xl stand and windscreen combo is VERY stable, so much better than my old gas set up. Boil times for 2 cups did seem around the 6-8 minute mark (never timed it). Didn't strike me as ridiculously long despite being used to gas.
The 'feathering' works but isn't instant...needs time to settle after any adjustments, so still getting used to that, TBH. Did do some simmering and it worked wel after fiddling.
Its largely thin aluminium and light weight, so needs TLC...but its a nice piece of work.