In reply to Blue Straggler:
I've got a coffee table 'inspired by' Noguchi, it wasnt cheap but much, much less than an official one. I took a good look at an official one and the only difference is that it lacks a signature and the bevel on the glass isn't quite as rounded but that's being picky.
I think you'll be fine with yours, there's a defined market for people who want designer furniture but can't quite justify the full price.