avro energy

has anybody switched too avro energy as they are cheapest deal at moment and I'm looking too switch from edf,they have only been around since 2015 and cant find any recent reviews on them i.e 2016-2017 I do know that they take first payment 3 weeks after applying and that always gets the alarm bells ringing as switching can take 6 weeks so they are taking money well before they even start supplying your energy.have always used one off the big six supplers and have always been unsure when it comes too switching too new or smaller energy providers as there are very few reviews on them or if there is any they are normally bad.

thanks