Hi, i just returned from MWC 09... I bought 2 Yoigo simcards (note: 2 different prefixes! 622 and 633 for "Yoigo 8" tariff plan) and I used the web service.
The quality is still poor: the price is ok, but coverage and service is almost crappy... I had coverage troubles in Gerona, then in Barcellona too
When I had coverage, I had bad service too... a lot of website really slow and a "false" HSDPA service. Next time I'll use them only for international SMS...