Metavision vs hololens vs magic leap vs dreamglass

Hi, I currently use a meta2 headset which is a development headset (most of them are) and by the time we got it shipped to Australia it comes in @ about $2500 Australian. I just looked at a company called Dreamworld who have a headset called dreamglass which can be operated off an Android phone in conjunction with a battery/adaptor, making it portable, all for $399 US (or $518 with the adaptor and carry case) They also advertise the fact that they have a unity SDK so I was surprised that nobody has commented on them on this site as far as my search goes, A portable headset with 2.5K 90 degree FOV seems to be the ideal AR companion, anybody else have a comment before I shell out my hard earned?