Last week we too delivery (well, I collected them) of some Dolium kegs to try out as our OWK - one-way keg, one of the new industry buzzwords!.
They are a traditional gas-on-beer keg with a plastic syphon tube rather than a spear; first impressions are they seem a bit flimsy and don't stack too well, but we'll give them a go and see. Feedback from other brewers and landlords who have experience of them is mixed to say the least, but with EcoKeg apparently opening a factory in South Wales shortly we'll have plenty of other options soon.
The major upside over keykegs (apart from being about a fiver cheaper) is that they use standard sankey connectors so they're, to use a phrase from my old career, "plug and play" with existing cellar equipment.
Anyhow, here's what one looks like....