I initially was slow to make regular orders with PC given the risk on the up front pre orders. Ultimately I got more comfort from the fact that they were getting so many orders that the risk of default became less and less. From an outside view, they don't appear to be taking much risk at all on their inventory because it is basically all pre paid. So they are unlikely to take big losses on stuff they are unable to sell. Really as long as they are making a profit on these pre orders everything should be ok. Regardless there is still an element of risk involved and I'm not happy lending my money out for 8-10months on these pre orders on an increasingly regular basis.
As for people still waiting on MP Ramjet, I've just sourced a 2nd Ramjet from Amazon Japan for ~A$170 with free shipping to a Japanese address (I use Tenso). Shipped to Australia will be $200-$220 depending on the shipping method and if you have other items to ship. That's really not much more than the PC price so if it were me I would take the refund and source it from Amazon Japan.