Great deal and an excellent platform!
I took advantage of the Moneyfarm offer earlier this year just before the ISA deadline. The initial investment, direct debit and cashback all went very smoothly. I did have to raise a claim to get the cashback sorted but it was resolved quickly.
The Moneyfarm platform is setup very well and it is easy for a novice to get started for the first time. People using this platform should understand that their money is at risk - you are investing over the longterm so do not panic over the dips!