Also don't pay any attention to your previous experience with Vodafone in one particular country. Like most large brands operating in multiple countries, Vodafone is fragmented and the customer experience will be very different in each country.
One use for a Vodafone UK SIM is
£5 for 25MB of data roaming outside the EU. Although you're unlikely to want to roam with a UK SIM, you can use this deal on aircraft (OnAir, AeroMobile etc) where the cost of data is usually extortionate.