Hi Greg, congrats on the new Swan, you'll love it. We have a 2011 Hawk OB with a Dometic 2200B. We have used it more for heating than cooling up till now. We wanted air con so that we can travel up though Broome, Darwin and FNQ in a comfort on our next big trip (probably still 2 or 3 years away). If you plan on Vic coastal trips you may not need it often, however if you plan to head up to the Murray River in summer it could get a run. Dometic brought out a new model (3000b) but Jayco did not want to fit to ours last May as they reckon it was too heavy (compared to the 2200b). Best bit of advice is 'happy wife, happy life!'
Cheers Macca.