When I needed housing for my new D-200 I did my due diligence and searched WP forums and the internet to educate myself. I settled on an Ikelite housing as it suited my needs and I felt that beyond the obvious price point advantage the ability to see the O-Ring seal was a real asset.
One of the "additional" factors effecting my decision was the numerous threads on this forum espousing the service after the sale that Ike offered.
I recently experienced that exemplary service when I had an issue with my 105 mm port. The details are really not as relevant as the overall experience so I won't bore you.
What I do want to convey is that Ikelite is a first class company that takes care of its customers and if a problem does occur they error to the customers side of the equation.
I was happy with my purchase before.......... I am confident it was the right choice now.