Well, this Vodafone offer has arrived outside of the Ukraine now on eBay:
advertised as "best roaming ever".
So if anyone is tempted, I would like to get your feedback about this SIM for the prepaid data WIKI. (I'm currently traveling in Asia, so I can't test it).
If these rates for data and calls persist, they will beat any EU roaming cap. In fact they represent in many countries the cheapest domestic option.
But to feature it more promiently, I'm going to need user reports about handling, top-ups, speeds a.s.o.