I used to work Handysnak's 5-on, 5-off and found it the best 24-hour system so far - so long as you live close-by during your duty days-or-nights and can get decent uninterrupted rest when away from work. Ideal for units in expensive-housing areas; people who normally live away from the unit but can get good, low-cost accommodation (I used to stay in a nearby police station, another unit's Snr Pilot stays on a houseboat) for the 5 days on duty benefit the most. For such people it beats the 4-on, 4-off system because the latter requires many more home-duty journeys per year than Handysnak's arrangement.