yeah, I got a couple 'for the kids' at christmas, not put them through the paces yet but researched a lot before buying. modern gopros quality is loads better, but the quality is acceptable (I just looked at some vids on the youtube). I would say go for the sj5000 though as that steps up the quality, I didnt as I was buying 2 and they will get limited use.
wifi and screen are very handy (especially for the kids that kinda expect this stuff as standard ha).
Dont get a copy. (yes they copy the copy ha, a quick google will show you the diff).
I'd buy from a UK seller too, I buy a lot of cheap things form HK/ china but bought these from UK as didnt want to get stung on import taxes.