We're definitely doing this, and were delighted when it came in.
For us it's a matter of necessity, but also suits me as someone who enjoys work.
I'm the main earner, and we also have a major, major change coming up at work in May. Baby due in December, so I'm taking December to middle of April inclusive as maternity, and then handing the rest over to my partner. Only issue is that the child has to be 20 wks, and as ours may only be about 16 wks, my OH may have to stick a bit of (paid and unpaid) leave on the beginning of his. He'll then take that time plus the 26 weeks of leave, paid.
It'll then be up to my partner whether he wants to continue being full time carer, go part time, or run screaming back to work! Whichever way, financially, we'll manage.
It's great- the care will be shared between us, we'll have enough money coming in, and baby gets full parental care for 10 months. We don't have any family who can help out whatsoever, owing to age, geography and disability, so this is great for us...and absolutely a step in the right direction as a social/political issue too.