My .02 cents - It is safe (but only until an exploit is discovered). This goes with any software though.
I used it for 1 year and updated it several times. My site was defaced twice while using it, both times because of flashchat, both times because I failed to update it when a fix came out (update). Because of the lack of attention that I give to addons such as flashchat, I decided to remove it. For the most part it was safe, but twice was too much for me. My time is stretched too far to worry about something that was never used on my site, so I removed it. Had it been used more, I may have kept up with the updates when they came out. My failure. My responsibility.
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