Moved to OVO as previous supplier was getting too expensive. Have saved over £30 a month in first year with OVO. Service is very good.I get reminder each month to give readings which are east to input on internet and it is great to be able to access my bills on line each month. As a result I have just signed up for another 2 years. I have had no problems to date so cannot say how good problem resolution would be. From experience so far, would highly recommend.