anyone has feedback for the mate 20 so far?

also some general emui questions for Mate 20:
- does it allow double tap to wake & sleep?
- any quick reply and drag to expand for notifications (eg for whatsapp & messenger)?
- how often is the security/patch update?
- does emui devices experience lag/crashes after 2-3 years?

seriously considering huawei, but not very confident with the software, appreciate it if anyone can share their experience on drawbacks and reliability

how's the dual band gps on the mate 20 and mate 20 pro? is it significantly better on waze, google maps etc?