I am also using Beszel after using checkmk. For me checkmk was way too complicated (but is also way more powerfull) to setup and maintain propperly. So I switcheed to beszel because it is much easier and good enough for my use case which is:

• Is the thing running at all?
• Disk full?
• CPU, network, etc. on full throttle for some strange reason?
• send me a mail if somethings wrong

Besides that I don't need anything. The only thing missing is SNMP support to check switches, routers and AP's.