Thanks. It is the DS-408 I'm considering. I asked about the drives spinning down as one review of the DS-408 I read mentioned the device never entered the low power state with the drives they were using.
The F1 Spinpoints were actually the first drives I considered but the Ecogreens appeal as they are more reliable & use around 40% less power.
I'm hoping someone's used these in the DS-408. Anyone? Failing that it would be reassuring to know Scan would exchange them for a different model if they're not fully compatible.