I switched over my parents to Momentum Energy electricity a few months ago after using the Vic Govt's electricity comparison tool and finding that they were the cheapest/simplest on the market. Now they're offering gas and I think I'm going to switch over my gas and electricity as they're cheaper than Energy Australia even after the 13% + 3% discount bonus for gas. They seem to have a fairly straightforward deal and you don't need to pre-buy credits or do anything fancy like some of the other suppliers that offer slightly cheaper rates. Looks to be a no-fuss deal. Plus since they're launching their gas offering they're also offering a $50 EFTPOS card for switching your gas and another $50 card for switching electricity. Key condition is that they can reclaim the $50 at a prorated rate if you leave them within 12 months.