i got the V3 a bit ago, was definately worth it for an out-of-box running solution. though the fan settings needed fiddling so as to not make too much noise.
KVMD_FAN_ARGS="--speed-idle=50 --speed-low=60 --temp-low=50"
anywhoo for those who never and are curious the lag is almost entirely on the return channel, processing the hdmi signal and getting it back to client side. it is definatley useable for programming but certainly not for any interactive graphics or gaming. i'm wondering if since its a processing bottneck if overclocking the pi would speed it up a bit... it seems to idle at around %20 usage as per the little display.