I used to use those types of kegs when I lived in Ireland. They were pretty much all you could get across the pond back then. In fact I had never heard of corny kegs until I came to the US.
There are types which take a CO2 shot from a small 'soda-stream' type CO2 cannister through the lid to keep them pressurized - otherwise you have to crack the lid to gravity flow, once the initial pressure is released. The one in the picture does not seem to have the gas connect, so your beer/cider will stale quickly unless consumed in one sitting.
I had one called a King Keg which worked well for me, here it is:
Brew your own King Keg 5 Gallon Premium Top Tap Barrel
It sports a gas connect, and a floating dispenser which allegedly alows you to drink ther clear beer from top, while the bottom of the keg is still clearing.
Hope this helps