We do not love GK and find them overpriced for their quality. Also, as one of the bigger brands (in Australia) if you buy one you are likely to see it on other girls too. Some girls love that, my daughter does not.
Sylvia P leotards are our locally made standard. We tend to see more traditional practice leos here from them than the weird strappy stuff they were selling to MG Elite over there. At any given day in the gym probably about a third of the practice leos would be SP, and at a competition probably half the team leos. They are super well made, lined etc.
I cannot say enough nice things about Destira leotards. They are not lined or anything so their design is quite basic, but they are soft and comfortable and their product range goes from little girl to quite sophisticated. And best of all, their customer service is really great. Because postage is so expensive to Australia (the postage is often more expensive than the leotard), I do not want to have to return anything, so each purchase I have made has involved a bit of back and forward emailing and they have been very patient with me.
We have used leotards from The Zone in the UK for years now. They are lovely and soft too and customer service is excellent. The only thing I have noticed is that the embellishments start to fall off during the life of the leotard. Not until its second year of wear, but certainly while it still fits and otherwise looks good. The leos get used hard though (worn once or twice a week and machine washed) so that is not a complaint.
My daughter is currently eyeing off some Milano leotards. I think that is a UK brand? So if anyone has opinions on those I would like to hear them.