I tried this the other day, on a £2 stake. Started off great, got on the board constantly, managed to unlock the DOND game itself by collecting the phones and my last two boxes were something like £50 and Big Money. I reluctantly dealt for the offer of £230, fortunately £50 was in the box so it was the right decision!
Anyway, I carried on playing and after this win I literally won nothing. Didn’t get on the board once after that, ended up spending £900 – can you believe it? Almost felt like it was compensated after collecting that big win. But yeah, in summary, I wouldn’t recommend this one.