I thought it was really enjoyable. The acting from Anna Friel was really great.
It did have a couple of cringeworthy moments but did get me in tears a couple of times. Especially when she was confronted by the bullies and her sister denied that she was her brother and then afterwards told her that she said that because she sees her as her sister.
My wife watched the first episode with me, refused to watch the 2nd and just the 1st 15 mins of the third saying it was crap, but she hates everything trans.
I thought there was so much material that they could have done a lot more than 3 episodes, but I guess the general public might have got bored...