Customers most agreed on the following attributes:
Good for the Cokin P system users.
It is well made and black coated. The coating could be less shiny, but it's ok. Fits well on the P adapter. You can keep it on the lens all the time and buy a P cap.
This is a good item and useful whenever using a Cokin filter. However, the price is kind of expensive.
With the Cokin filter holder, it provides an inexpensive alternative to buying glass screw on filters for my medium format lenses.