Asda Mobile PAYG - any good?

I've seen an ad about Asda mobile doing PAYG for 8p/min talk and 4p/text. I think it is through Vodafone. Does anyone have any experience of Asda mobile? Not sure whether to switch as I'm currently with Orange and paying 10p/text on PAYG. I don't want to go on a contract as my typical spend is under £10/month and it is mainly texts and emergency calls. It does say that you can put the Sim in any handset.