Well I think they went away from those devices for just that reason, Saint. Besides the diaries have to be much cheaper. They gave me a munificent $5.00 (cash, up front) to do this.

Because, if you think about it, it's probably better to sample 10 houses with diaries for the 'cost' of one house with a device. And I don't know if everybody skews their data, but I did.