I have a Netgear ReadyNas Duo and have found it to be really good although I have only had it for a week.
tragically1969 – interesting to hear that about disk rebuilds on thus unit.
I have also used Western Digital MyBookWorld and IcyBox's in the past and have found both to be rubbish. I bought 3 of the WD units and 4 or 5 IcyBox's and all have failed. Getting support from UK dealers or RaidSonic for the IcyBox's was a joke.
Support for Netgear is great but I am a premier partner which makes this easier. I am happy to talk to Netgear if anybody has a problem with their products.