We did this - Cancelled Sky in favour of Netflix + Now TV's Entertainment bundle.

Not looked back, despite the many, many calls from Sky.

Sky's main mechanism for customer retention appears to be call center staff basically pleading to have you stay - a few years back when the bought the ISP I was using the quality of service collapsed and I cancelled the account and they kept dropping the price and wouldn't go away until I said I didn't want their service at any price (even free).