I have a 290GH module working just fine. I installed most recent firmware onto an SD card for the pi, plugged it all in. Have it OC'd to 305-315GH depending on heat, runs like a champ.
ehash.com is their official site now
the email works fine, when I had some initial learning curve problems, I had a full email conversation going on w/ like 3-4 emails a day, back and forth. All questions answered.
When the price was lower on these modules, they were a great buy!

Feel free to pm me and Ill try to answer ur questions!