Just my two cents (coming from a guy who jumped on the Neural DSP/QC bandwagon early in 2020...), I think Line 6 is crushing it. This is a brand new modeler and they have in a short time already made drastic improvements.
I understand it's a LOT of money to invest in something that isn't fully developed yet but that's what you gotta do these days. I feel like in 3 months Line 6 has done more than Neural DSP had done in a couple of years. Moving much faster with more transparent timeline and messaging. I love that.
I feel happy coming along for the ride with the stadium and find it exciting. Showcase is awesome and something that's never been done. Proxy I am very excited for. I'm willing to go on the journey with Line 6 and have a lot of respect for Eric Klein and company. Me and others with a QC have been waiting 5 years for some things that were promised to happen "SOON" after launch (ie. plugin compatibility), lol.
If you need the OG helix with gapless preset switching, I would recommend gigging that and holding off on the Stadium. The OG helix is a fully mature product and there's nothing wrong with relying on that. I have a feeling gapless preset switching is coming...