Well, having switched over on 28th November, I am still awaiting the €50 Tesco voucher which their advertisement promoted with "Switch to us before 8th December and we'll send you a Tesco €50 Gift Card just in time for Christmas". They list 5 reasons to switch, one is "great customer service".
They are pretty awful, for a business in 2014. I phoned on 7th January and this call was updated on their "system" on the 20th January and it takes 10 days from 20th January for investigation by their Morketting (sic) Department.