So I'm lucky enough to have had a fair bit of money set aside for a new PC as Alyx was announced (and then spent a lot less on a second-hand PC and bought a second-hand headset with what I saved) and I've got to say from what I've played it's pretty fantastic.
I was previously in the camp that thought VR wasn't there yet, the loss of movement wouldn't make up for the immersion and the hardware was too uncomfortable to really support that immersion anyway and I thought the need to keep a locked 90fps would see impacts on how games were designed (less enemies, particles etc.) that would leave them as less than what they could be were they traditional experiences.
Now though I think I was largely wrong, while there are significant tradeoffs (movement just won't be as well implemented or important in fast-paced games), Alyx is a full-blown game, and the experience VR offers is pretty incredible. Stuff like two handed interactions are really satisfying and demand a certain level of skill that other VR titles I've tried seem to be afraid of. Whether there will be any large amount of games in the future that match Alyx's scope and polish isn't clear yet, and if I weren't totally obsessive about the Half-Life series I would never say it would be worth the entry price, but Alyx is no gimick, even if I still think a lot of other VR titles are. It's like moving from keyboard only FPS games to using a mouse (but admitedly now a worse keyboard) it's a whole new level of input for a game that, while still a little clunky (Alyx is great but outside of Alyx every game I've played has controls and guns in particular that felt a little off), offers something really cool that traditional input just can't.
Do not even look at Alyx footage if you haven't played HL2: E2 though, you have been warned.