Your life is dependent on you doing your part and making sure the device grabs just as with a hitch (which sometimes fail to grab and have to be nudged).
The RR has been in use for a few(?) years now and I haven't heard of a spring failure. The spring is under very low stress and very unlikely...
Without the spring the RR will not normally grab the rope on it's own. It will still grab if you bump up the bird (top arm) just like setting a hitch. Once set, you can hang and descend normally.
Here's a demonstration by Yoyoman...
https://www.youtube.com/watch?v=7Z2IYTDchTM
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