Use with careful

I use the GP for my EOS 40D and have to say, with "smaller" lenses (focal length to 70mm), which are correspondingly easier than the thickness 70-300mm Canon certainly very successful and useful.
At our cat tree, the monkey holds bravely unless my thick 630gr heavy 70-300er on the camera.
Say: Lateral attachment is in itself not an issue, but only up to a certain weight and no, they were not 3 kg; I have bangs range since.
But: You have to work just a little rabid or punchier apparently when aligning the monkey legs and quasi "firmly suppressed" (see customer photos, which on the back of a chair).
For fixed or relatively level ground no problem, but if it is a little harder, then the positioning:
All first set really nice tight, gently insert the camera into the shoe and then release gaaaaaaaaanz careful and first wait for a moment whether the stability also keeps its promises to the eye.

Conclusion:
+ Klein
+ Light
+ Flexible
+ Adapter screw

- Very meticulous in stability at high weight load
- No storage for adapter screw (and so small parts have indeed the stupid habit of disappearing)
- Coin / screwdriver for precise detection of the head needed

In itself, therefore, already usable, but in rough terrain is not much, unpack quickly, cut the branch it thick camera ready - holds.
But rather: unpack quickly, somewhat coarse firmly press somehow on the thick branch and hope that will suffice, Camera Carefully insert, wait and see what happens.