Noisy old G-RAID here too
I've got a 4th-Gen 2TB G-RAID with USB2/eSATA/FW800 interfaces that's almost 4 years old, and it's as noisy as it has been bulletproof for me. I connect via an eSATA cable with a USB3 converter. It's as noisy now as the day I bought it! The throughput has been great, and constant since Day 1 too.
I stopped using my G-RAID for video work but still use it as a Photoshop scratch disk. I've moved on to a 2-disk custom RAID0 setup with 2 M500 SSDs for video and scratch - compared to my G-RAID it's much faster, much quieter and lighter, has a smaller power brick, and not much more expensive when I figured out the labor cost savings. I'll even use my LaCie Rugged 256GB SSD for short videos before lining up my G-RAID - so much less clutter and noise. But, that's just me.