Was wondering if anyone had any thoughts as to whether there are any real differences between Silix's and Ruby's 42mm PO with ETA. Ruby is selling hers for about $179 and Silix is selling his for $150 (but once you figure shipping, it goes up to $178). I previously read that Silix's PO comes from a different factory and is different than Josh's and Andrew's, but I don't know anything about Ruby's. Can anyone help?