If you are using the swan necked kettle, I can see why your arm gets sore..... a litre and half of water held for a pourover is a lot heavier than the same litre and a half in the kettle on the base!!! (just think... some folks pay to go to the gymn to build up arm strength.....) I use their V neck kettle, variable temp, and LOVE the hold temp when finished feature. I mostly brew either French press (1.5 litre) or Aeroppress, so I don't hold up the kettle for long. I've done smaller events with a second kettle, alternating, brewing French presses back to back when a large crowd WANT COFFEE NOW.
I used to use and sell the Bodum Ibis line, I liked the fact that the base fit inside the kettle with the lid closed, which prevents leaving the base behind somewhere (that's how I figured it out..... lost one base plate), but those kettles had a fatal flaw where they had cut a fraction of a cent in building, and I had to warranty a lot of them. I tried the new version, better, but the HUGE base is a nuisance for portability. So far it is working, only been in service at home for about four months. But whenAmazon sell them below my landed cost, that means I don't sell them anywhere, because anyone can get it cheaper there. Sigh.....
The closest to unbreakable I ever knew was the Krupps 1.5 litre unit. I bought one in 1997 and used it on average two times per day, at least, it finally died last fall, What's that, nineteen years? From a fifty dollar home appliance? Amazing. It was fast, easy to use, basic, the base was no bigger than the bottom of the kettle.
I have seen and used the Breville 1.7 litre variable temp unit, if memory serves it also has the hold temp feature. One of my coffee suppliers use them in their cupping room, and they get a LOT of hard service, and have been running a long time. When looking to take on another line of kettles I'll look into those.