Goods arrived on the latest date set, which I was fine with, as it wasn't 'late'. Online cost calculator incredibly underestimates. It gave me a price of around £20, which increased to over £100. They also simply sent it to another company, who are also trying to charge me more on top of this. If you want something delivered where money is no problem, this service is fine.
(Update): recently charged an additional £50 by a random company that comgateway sent the package too. I researched any addictional costs on their website and could not find this. I would have preferred to use an expensive service who told you the total cost upfront.