Experiences please good and bad about using these. Currently in Spain with very unreliable site wifi. Another resident has a Vodaphone dongle giving 50 gig per month on a monthly contract at £30 / month ( plus original cost of dongle) the speed is acceptable and I'm considering doing the same. But reviews are very mixed and VF service comes out pretty badly. Would like to hear any views of VF and O2 or others. Thanks