Shoes have now broken in.
I think the sizing is a little more generous than the old pair as they have stretched a little (probably half a size as opposed to the quarter size of my first pair).
When compared with the old pair the rubber is a little thinner on top of the toes and thicker on the rand. I think they will last a little longer, the only issue I had with the old ones was that the rand would deform past the end of the shoe and you ended up wearing out the rand first.
The heel isn't quite as good as the old pair, but i think the issue may be that they have stretched more and as result not as tight, as opposed to being radically different. Generally they fit a little more generously.
All in all they feel like a slightly less focused version of the old pair which is disappointing as they were one of the best shoes I have ever owned. I am not entirely sure if this is down to an issue of them stretching out more than the old ones and I would be better with half a size down, but time will tell.