Should I Replace Crystal Mounts Immediately?

I inherited a small collection from a relative - generally unused commemorative stamps from the 1940s to the 1960s that are mounted with Crystal Mounts. The collection also included a few packages of Crystal Mounts of various sizes.
Based on a couple of comments I have seen, my sense is that Crystal Mounts are considered inferior to other types of mounts (e.g., Showgard, and perhaps others). Sorry to have to ask, but why is this? And should stamps mounted with Crystal Mounts be remounted with other brands immediately?
Thanks in advance for your responses!

Inferior would be an understatement. Crystal mounts were more likely to damage stamps than protect them.

Thanks, JLLebert. Do you know how the stamps would be damaged? Damage the gum, change the color, or something else?
In any event I'll start replacing these mounts right away (and toss the bags of unused Crystal Mounts). I'm just trying to figure out if I need to do anything to these stamps during the remounting process.
Thanks!