Saw a bit on the Discord server, guy tested the backplate and found that it had little appreciable thermal gain, but the vent hole over the fan made it much much louder. "Unusable without a headset," were his exact words, "cannot recommend unless you exclusively play AAA games with headphones on"
I run everything at 720 so I can go seamlessly from docked to handheld, and quite frankly, this little magic Gaben rectangle has no business performing as well as it does.
If you're trying to run games at 4k, then yeah, it's not gonna be as good. Temper your expectations