It seems GiffGaff is a marmite type experience. You either love it or hate it. I'm on the love it side.
I have 2 kids and it costs me £20 per month total. For my £20 they get unlimited Internet and unlimited texts. They're happy with that. Very happy. They also get 250 cross network minutes and free giffgaff to giffgaff calls, but they appear to have lost the ability to talk on a phone and hardly use these.
Giffgaff is backed by the O2 mobile network, indeed GiffGaff is owned by O2, so the connection is great.
Personally, I have never had any problems with GiffGaff and am happy to recommend them
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