1. Performance and Speed: The NETGEAR Nighthawk M1 delivers impressive download speeds up to 1Gbps, making it a reliable choice for both home and travel use. Users have reported speeds comparable to fiber optic services, with some achieving 47MBPS down and 25MBPS up.

2. Ease of Setup: While the initial setup can be tricky, especially configuring the APN settings, once operational, the device provides a strong and continuous signal. Assistance from carrier tech support may be necessary for optimal setup.

3. Battery Life: The Nighthawk M1 boasts a long-lasting battery that supports all-day use on a single charge. However, some users have experienced issues with the battery not charging after several uses.

4. Device Connectivity: Although marketed to support up to 20 devices, real-world usage suggests that connecting more than 2-3 devices simultaneously can overwhelm the router, causing it to reboot frequently.

5. Customer Support: Netgear offers limited support, with only three months of free phone/email assistance. Beyond this period, users must pay for additional support, which has been a point of frustration for many customers.

6. Compatibility Issues: Some users have reported compatibility issues in certain regions like Canada and difficulties with specific SIM cards. It's essential to verify compatibility with your carrier before purchase.

7. Value for Money: Despite its high price point, many users find the Nighthawk M1 worth the investment due to its robust performance and reliability in areas with poor cell signals.

8. User Experience: Overall user satisfaction varies widely; while some praise its performance and ease of use once set up correctly others criticize its limitations in handling multiple devices simultaneously and poor customer service experiences.

The NETGEAR Nighthawk M1 is best suited for individuals needing reliable internet on-the-go or as a backup solution at home but may not meet expectations when used intensively by multiple devices concurrently.