I've had a Surface Pro 11 with the Snapdragon Elite X CPU since launch day (so roughly a month now) - and it would take a lot to swap this device now.
Admittedly I'm not new to ARM having used Surface Pro X and the Surface Pro 9 with the SQ3 CPU in it but this thing is just a new level completely.
Battery life is incredible; I'm easily getting 10-11 hours of productivity out of it meaning I don't need to worry about charging at all through the day, thats mainly admin/office type stuff, a few Teams meetings, some Power BI, etc - not video editing or anything but that's not really what this is for yet,
I managed to get just over 14 hours when playing video/streaming sport over the weekend with it on my desk so it easily surpasses my expectations here and its certainly more battery life that I've seen out of almost any tablet.
The performance is excellent, its so much quicker than the old ARM devices; everything is snappy and fast, there's no slowdown, there's very few things I've come across that don't work and even the odd non-ARM thing I need to use works great.
I love the new OLED screen, not that I really had much if any issue with the already excellent LCD screen on the Surface Pro anyway; I know some people have complained about graininess but I can't say its bothered me at all (its also a complaint I've seen about other OLED's like the iPad).
The only thing that really bothered me was the lack of a 5G option at launch, all my previous ARM Surface devices had a SIM slot, but I picked up a 5G mobile router instead and actually I suspect I'm getting better battery life with the Wifi Only device anyway as its not constantly using a modem.
I have considered swapping over to a Surface Laptop 7 with ARM but I think I prefer keeping the Tablet form factor even though I'd get even better battery out of the laptop (as its a larger battery).
I expect we'll see lower end Snapdragon X CPU's in fact I'm sure there's already one in the range but its not been released yet, I'd love to see an ARM Surface Go tablet.