As well as going in to the office Mon-Fri I usually work from home for a few hours most weekends to make up 40hrs for the week. Occasionally I will from home during the week. I like working from home, but couldn't do it every day.
I think I am very productive when working from home; Working from home during the week saves 2 hours of commuting a day so I am more likely to work longer, I am less likely to be interrupted by other devs or general noise in the office, and the big plus is my stereo, record, and CD player are all here so I usually have music on all day which really helps to get in to the "zone".
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