To Seacast or not?

When I redo my transom I'm thinking of using the seacast transom repair. So I'm wondering if anyone here has actually used it and would be willing to give pointers. I've read good stuff on it so far (mostly on sites where it's sold) but I haven't been able to find any non-bias reviews about how well it works, or how easy it is (or isn't) to work with.

Seacast also seems to be good for stringers (and maybe even bulkheads) but again, I can't find any non-bias reviews. Can anyone out there speak from personal experience?