Spring Hatch & Lid Holders: Anyone Ever Use These on A

Has anyone ever used these spring hatch holders. What was the outcome.
Basically, to release the holder (cause it to bend in the middle), just press the sping in the middle. The maximum load support that I have read on a particular spring is 100 lbs and the maximum load support on another one was 10 lbs.
Here's a few links and a picture:
http://www.thmarine.com/product.cfm?PRID=14
http://www.shop.com/op/~T_H_Marine_Hatch_Support_Spring_Aluminium_Mount-prod-34005942?buy=9
Todah
Basically, to release the holder (cause it to bend in the middle), just press the sping in the middle. The maximum load support that I have read on a particular spring is 100 lbs and the maximum load support on another one was 10 lbs.
Here's a few links and a picture:
http://www.thmarine.com/product.cfm?PRID=14
http://www.shop.com/op/~T_H_Marine_Hatch_Support_Spring_Aluminium_Mount-prod-34005942?buy=9
Todah