About torrenting - its about violating laws related to copyright. I don't really care about that, its up to you and your country. In my country god bless its not criminal to download files from torrents. And i'm not really using that, maybe rarely for something work related (some content that can be freely downloaded with fast speed (i.e. free content, not cracked or something like that).
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I'm the user of WR3000H (cudy). I'm not sure that i can recommend the router for everyone. The price for router that has anything that i need and its much better for different things for me was asus, its like 10-15 usd more than cudy, but their firmware in my opinion remove a lot of headache of configuration.
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The second problem - openwrt was new to me. I really had no clue wtf is that. I have programming & network experience, but its not good qualification. Because i'm nerd, i was able figure out how properly everything configure after ~4 weeks. Even time to time i keep return to openwrt and reconfigure, test, experiment with different things there. I mean its more toy to me, than 'configure & forget device' for now.
If you wish to avoid tons really tons of problems with configuration if you have no clue what are you doing - avoid going deep into openwrt (no disrespect to openwrt, sorry guys). Openwrt pretty damn big project, i mean it. Really big, and thousands of newances.
Asus default firmware support everything you need done in simple way + support.
what is my setup?
I'm from Ukraine. I have provider that i love and provider that i need (two different ones). Because of attacks against civilians here - we have like ~7-12 hours per day with electricity. While no electricity - FTTB works fine from power banks, while ethernet does not (switch turned off).
That why i need some kind of dual wan thing. Cudy WR3000H does not support it out the box, while asus - do support that.
For now i underestand how easy all things are after a lot of experience with openwrt, bridges, macs, and tons of mistakes, but at first few weeks - it was really damn hard.
So i have failover connection with fallback.
Plus i have guest network for neighbourhgs that does not have internet to support them, and the traffic from guest network covered by VPN. Because i dont want them to connect to prohibited websites & have responsobility for that. Plus there is forced dns hijicking thing for forcing DNS for not avoiding country laws + installed adblocker software to filter some domains & ads.
I have pretty good results with all of that, and i familiar for now with openwrt, and feel comfortable. But i tried original firmware - and its a little bit better out the box. Not good as asus, but better.
So what do you need?
Any router with 256+mb ram (512 ideally) 2-4 cpu cores for router.
Avoid Wifi7 and other crap. Even with wifi6 as i know now - you can't do too much too because of tons of limitations related to channels and so on.
Purchase any vpn (mullvad, nordvpn, etc) that has wireguard.
Upload config to your router via their graphical interface -> and all traffic will go over it.
Do your things.
Sorry for wall of text & wall of errors in my "igrish"