The Alcor's 3090 is quite a good implementation and it feels relatively responsive, as far as 3090s go. There is a bit of smoothing on the 3090, but it feels quite raw.
You can definitely perform with it.
The AM010 in the g402 feels better though. Less smoothing below 2080 cpi I believe (very little). In terms of sensors, definitely go with Logitech. The AM010 feels amazing and is closer to 3366 than to 3090.
Feels very responsive and raw.