Nice app and website, but had significant issues both when switching to Bulb initially, and then again when moving house. Accounts were not set up correctly in both instances, which led to significant confusion and energy supplies being shut off. Customer service was pretty poor and only when formally escalated to the complaints team were issues handled properly. Communication is awful, particularly through the live chat. Even now, months after moving, a query about final account balance is still unaswered.
Overall, I wouldn't recommend Bulb.