1. Performance and Speed: The GL.iNet GL-AX1800(Flint) WiFi 6 Router offers impressive speeds up to 1.8 Gbps, with 600Mbps on the 2.4GHz band and 1200Mbps on the 5GHz band. Users have reported smooth streaming, gaming, and video calls, though actual speeds can vary based on network conditions and VPN usage.

2. VPN Capabilities: With support for OpenVPN and WireGuard, this router provides robust VPN functionalities, achieving speeds up to 500 Mbps. However, some users noted that certain devices like smart TVs and Fire Sticks may require specific VPN rules to function properly.

3. AdGuard Home Integration: The built-in AdGuard Home effectively blocks ads and online trackers, enhancing privacy and browsing speed. Users appreciate its ease of activation through the web UI.

4. Device Connectivity: Utilizing OFDMA technology, the router efficiently manages connections for up to 120 devices simultaneously. This feature is particularly beneficial for households with multiple smart devices.

5. User Experience: The router's user interface is praised for its simplicity and responsiveness. Firmware updates are straightforward, though some users experienced temporary speed drops after updates, which were resolved with subsequent patches.

6. Remote Access and Management: The router supports remote access via an app, though VPN settings cannot be adjusted remotely. The web-based interface includes a live map feature, though its functionality may require further exploration by users.

7. Stability and Reliability: Overall stability is commendable, with occasional lock-ups that necessitate rebooting the router. Users have found the repeater mode particularly effective in maintaining consistent connections.

8. Conclusion: The GL.iNet GL-AX1800(Flint) WiFi 6 Router is a versatile and powerful device suitable for tech-savvy users seeking advanced features like VPN support and ad blocking in a user-friendly package.