I only use wattage mode so can't help you with that. The cage is as big as the knightv1 my merlin fits without issue. I am sure I will buy a knight v2 very soon either way...maybe grab the sale over at gearbest
Great side by side pic. You will revert to the Tesla button as it is a more natural position than the Smoant/XVO. I ended up passing on the Tesla as I wasn't crazy about the styling of the battery door and the fact that the tank well diameter was not as large as the Smoant and only capable of handling 22mm max diameter tank. The Knight V2 Preheat under TC was greatly improved over the V1 so I went with that instead.
How does the Tesla do on TC & Preheat functions? That is essentially using a StarPlatt chip isn't it? Never heard a performance report on one of those.