Ann: Appendix 4C December Quarter 2014, page-47

I think everyone would like to know what the gross margin is. I have certainly asked but Management, not surprisingly, were not willing to disclose it.

To provide some comfort you can look at the second half of FY14.
WRR did $7.1m revenue with a GM of $2.9m = @41.3%
So GO contributed about a third of that revenue ($1.8m) yet GMs were maintained at higher than average levels. That suggests GO margins are reasonably in line with other products.