Hi OP, I think they're great, partly because I live abroad so they have great English things for DD and partly because it is, some of it a bit 'tatty' but the children love that IMO.
Last year I got DD (8 at the time) a girls 8 year old stocking, it was great but too young really, and too girly for her.
This year I have ordered and received boys 14 plus (she is now 9) and would say it is absolutely perfect for her.
So... for your 17 year old I would definitely get the female adult. As 14 plus is suitable for my DD who is 9!
They are good though, loads of bits and it does work out cheaper! (Well, maybe not with my postage)
I also supplement with a few things, satsuma, chocolate and a nail varnish or somrthing I know she wants.