Thought I would give a quick update on this for those who care :)
I bought the i5 jobbie. A bit on the steep side in terms of price and spec but I had no other short-term solutions.
Must say, it's a nice bit of kit. 6 Intel LAN (I do wonder if they fake though 😆 ), i5, I put 4GB RAM in and a spare 60GB MSATA I had.
Setup was painless. I did a final backup of my existing one, installed pfSense and restored the backup. A quick interface remapping and I was done. Shut down, switched out and booted. It all worked :)
Thoughts:
Speedtest always showed around 290/300 over wifi. I now easily get 350-360. (Wifi is Ubiquiti kit)
VPNs are faster. Much much faster. I always use PIA and peer locally but only ever got 70-80Mb/s down. Never an issues as I don't need more than that (other than speed test 😁 ) I now get full bandwidth. I got 340 to NL (I am not in NL....) So, a combination of faster CPU and AES offloading makes a massive difference. Odd thing though, I never saw the CPU peg on the old j1900 which lead me to believe it was ok.
Acid test. Not once have the kids simultaneously gone "DaaaAAAAAaaaaaDDDD I'm lagging!" from across the house Likewise, myself and my wife have continued to work on video calls without issue.
Could I have bought one of the £200 cheaper Atom ones and had the same result. Probably.
Would I recommend this setup for someone? Sure. It's compact, neat, costs about the same as a self-build (but looks better)
A gamble but it paid off (so far). Thanks for your help on this. Hopefully someone else reads it and benefits.
FB