Accessories provider better than Canon?

I have bought several Gelis for my lenses, Orignalteile and accessories. What the Canon GeLi not offer: A screwed Polarizer (or other filter) can no longer be operated when these GeLi is turned on the lens.

What the accessories Gelis offer: consisting of 2 parts, these can be screwed onto the lens, have both side a thread, so that one in the order Body -> Lens -> Polarizer - can mount> GeLi and Geli allows it that you can adjust the polarizing filter, simply because it is mounted between the lens and GeLi. That's a big advantage to not offer the Canon Gelis, because they are turned directly into the lens and the polarizing filter is the last link in the chain and therefore can not be adjusted because the GeLi simply in the way.

A clear case of undurchdachtem product design. That one can solve better show others, and especially favorable supplier whose products are of equivalent quality as the products of Canon.

Unfortunately, only average and therefore only 3 stars.