I think those who have the old Quad and can't get Lion to work should consider upgrading to Buffalo's latest hardware anyway. I've been running a Linkstation Quad since early 2009 and its been very reliable, however its slow as a dog. I got a Linkstation Pro Duo QVL on sale for about USD120 (without drives) and it is so much faster than the Quad, its not funny. In fact, users are saying that its as fast as their local hard drives. Furthermore, 2TB drives are dirt cheap now.
Basically there has been a huge jump in price/performance for Buffalo products with the hardware released in the last 6 months or so, while prices have dropped. I did look at QNAP/Synology, but they are more than twice the price. What to do with the Quad? I'm using it as a backup for the Pro Duo. I schedule a NAS-NAS backup once a week and the Quad just wakes up automatically for that day. Otherwise it sleeps for 6 days a week.....