Upgraded from a Helix LT that I had for ~3 years. There are many similarities between the LT and Stadium as far as use, but the LT presets that I transferred to the Stadium sound very different and not very good. It has been mostly easy to "clean up" the presets that I have used so far each Sunday although several had to be rebuilt. The result has been a superior sound to what I was getting with the LT (and I thought the LT sounded good...but I'm no expert). Another few perks relevant to me: the audio interface to my DAW has a significantly lower latency, not that I can tell it and the "feel" of the sound with my playing is different. I've not played through an amp in a few decades and had forgotten that finger/pick to string to sound feel even though I'm using IEMs (Shure SE215).
The buggy parts are related to the editor and the wifi connection to my PC. I have no doubt these issues will get sorted out as Line 6 has an excellent reputation for continued improvement through updates. The are also a few remaining features that are to be implemented eventually to the Stadium platform. For me, those are icing on the cake!
The cost of the Stadium is a little thought provoking, but I suppose selling the LT would make the price then seem well worth it (too late though, I gave it to a friend at church).

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Great screen and response. Be aware that firmware upgrades are not working properly via wifi . I had issues with the windows app. Luckily I have an old Mac. No issues there completing the firmware update. While this seems like an inconvenience it is normal when a new product comes out. Be patient, line 6 will address this soon

I used the HX Stomp for many years and I'm truly amazed at how much easier the stadium is to use. I knew it would be so much powerful so I thought I had a tough task ahead of me. Less than a week in I feel I can do much more with the Stadium than I could ever do after many years with the Stomp.