Nemo hatches: Any feedback?

[Weyalan]

I need to replace the forward hatches on my boat. The existing hatches are 23 years old, they leak and the plexiglass (or polycarbonate, or whatever the material is) is pretty well crazed, so it's strength is probably significantly compromised.

Whitworth Marine currently have a special on "Nemo" brand hatches; see link

Whitworths: Nemo Aluminium Hatch 500mm x 500mm

The hatches are the right size and look pretty good to me, but I'm hoping to get some feedback from anyone who has these hatches on their boat, or who has heard anything good, bad or otherwise...

Thanks in advance