Depends on what your usage is as they don't have a trier pricing structure, just a flat rate per KWh. So for low / low end medium users you should save money. Plus no charges for different payment methods.
If I do switch to them,
Electric: Is within a few quid per year compared to BG new Websavers 1 price
Gas: will be saving £ 70 / year
I only use web comparison sites to get the names/web addresses for the energy companies, then I go to their websites and check the price for myself. I think most of the energy companies will be reducing their prices over the next couple of months to follow BG. But only after everyones switches the heating off in April. The bright spark who decided to link the price of wholesale gas to oil barrel price needs shooting

. Where's the decrease is price, the price of oil has dropped from around $150 / barrel to around $50, yet still no BIG decrease in prices to the end user.