A similar system was introduced in Germany on 1 January 2007. Our first son was born late 2007 and our second in 2010, and we took advantage both times. There are 14 months of paid leave available, remuneration is at about 65% of salary, and two months of the 14 are reserved for the second parent; if the second parent chooses not to use them, then the total amount of leave is reduced to 12 months.
The first time, I wasn't earning (I was a student), so my husband only took the two "Papa-Months" as they are called - on one salary, we couldn't afford for him to take longer. In the two months he took off, I took exams and qualified for the final written part of my degree. The second time round I was working, and so we split the leave 7 months for me - 5 months for him (we kept two months back but in the end we didn't use them). Now we are expecting our third child and are initially planning a 50-50 split (six months each), with two months reserved for me again next summer if the childcare situation is not settled.
The culture around parental leave has started to change significantly since this system came in. In the first year or two of parental leave, the take-up rate among men was low (I think around 10%) and they mostly only took the two Papa-Monate. But since then the take-up rate has gone up to more than 25%, and although the proportion of men taking more than two months is still fairly low, it is rising too. A lot of men still claim that it's difficult for them to take the time off, their boss won't agree, etc. But as men come under more pressure, at least to take those two months off work, it is becoming more acceptable and normal for men to take responsibility for childcare. And of course, it has become more normalized and acceptable for women to go back sooner if they want to, because they are not needing to pay for institutional childcare for very young children, but can still have them cared for at home. My husband worked for a very male-dominated firm when our first two were born (landscape gardeners - all employees apart from the two secretaries were men). His boss wasn't exactly in favour and he had quite a bit of banter to put up with - but his parental leave paved the way for others since then. If the culture can become more accepting there, then it can change anywhere!
One small problem is that the two (or more) months of leave for the second parent don't have to be taken sequentially - they can be taken alongside the main parent's leave entitlement. This is great in some cases - it allows fathers to take of e.g. a full month or even two after the baby is born, great for bonding, especially if the mother had a difficult birth. BUT it doesn't encourage domestic roles to change much - mothers then still do all the childcare, and the fathers are there to help out.
I really think it helped us as a couple that we always took the leave sequentially. My husband got loads of confidence about his ability to manage a baby (and then a baby and a toddler!) and I also realized that his way of doing things was different but not inferior to mine. It also made it much easier to split up e.g. taking sick leave from work when the kids are ill. I know lots of mothers who are stuck with this job because it is somehow always their responsibility to look after poorly kids, even if they work. My husband feels entirely responsible too after several months of being primary childcarer, and when the kids are ill we split up the time off between us. It really makes us feel like we are equal at home, which in my view is a huge advantage. In fact, there is no way I would have considered a third child without this system - I'm happy to split parental leave again and spend some months at home, but would not have been willing to take on another baby (and 12 months+ at home) completely on my own.
I really encourage all parents in the UK to take advantage of this system if they possibly can - it might mean making financial sacrifices in the short-term, but in the long-term it will help change the culture of childcare both in the workplace and at home, giving both fathers and mothers the freedom to enjoy parenting and the possibility of continuing a career.