For small Easter eggs these aren't all that bad. They're actually pretty nice in fact. It's just that I doubt that anyone, like me, would be able to consume more than one at a time.
I'm not a huge fan of some of the cheaper chocolate that Thornton's sell as its not often all that great quality, but if you do want to give your children less chocolate, then certainly think about buying these.
I once tried to make an Easter egg, but I didn't really compare to the professionally made ones. This is how you should make one if you want it to turn out nicely.
Tesco do put their brand to some very interesting Easter eggs and do actually do a good job of offering something a bit more high quality than the cheap Nestle stuff they sell for next to nothing.