Toombie, it all depends on your application.
When we go camping - fishing we tend to stay at 1 spot for up to a week. Deep cycle batteries are hopeless to re-charge, as they accept a small charge.
With the Odyssey you can run them down and fully re-charge in under 1 hour with a charge rate of around 50 amps and a battery life of 8+ years. We do this with a Christie Engineering Honda battery charger (about 1/2 litre of petrol to re-charge a battery). This allows us to use our fridge to freeze fish even after we have been camping for a week and not turned on the car.
Also, we swap the engine battery and the fridge battery regularly (via switching) so both have the same type of usage.
As you say, excellent cranking and winching batteries also.
Erich

