The system is ingenious, but hardly allows fine adjustment of tightening, given the heaviness of the system to unlock the hooks before changing the setting.
Saddle:
the clip is not blocking for sure: it can be opened even when locked. Precisely what one would like to avoid
(Apparently, the clip seal abuts on the collar for fixing the saddle)
- In addition, the clip is designed for a seat post collar planar edges at the clamp. Or on my bike, the collar is tightening curve at (classic layout). Luckily the bike attachment comprises a part of the original adaptation.
Front wheel: the clip ended up blocking, but not in the position provided by the manufacturer, who has forgotten that some bikes have fenders, set precisely where the clip should close.
Rear wheel: it works, apparently.
For safety, I have twisted long lengths of wire to delay a potential thief not satisfactory at all.
Finally, finish fasteners is in a nice black paint, without asperity. Result, it's slippery, so that it is still in tightening force. So I had to use gardening gloves for a little gain and avoid hurt me every time my hand ripait on painting.
Conclusion: avoiding.
