Gotcha. Yeah, the dev kits on some of those are a bit pricey (2k and up).

Coming from an industrial use-case, I personally really liked the Realwear HMT-1 — it performs like a champ, is surprisingly comfortable, is available as intrinsically safe, and has an easy-to-work-with team behind the scenes.

Would strongly consider skipping Glass EE, depending on what you want to do.