I'd buy a holodeck even if 50% functional. I think as long as it does not kill me its good, eh?
However never buy in 6 mo is a fairly good soft restriction. You can probably wait 2 months and buy it. My rule is "don't give in to the hype".
I also have the same outlook as I did with the iPod. If it is expensive wait till there is some good competition because after some good competition it can only get better, or the competition will. No competition = shit products. Hence Pentium 4