I used to use this module in a project of mine where I'd be trimming potentially millions of strings during a program run because I thought any possible speed up from XS wouldn't hurt.
However I have noticed a 2 grievous bugs in the software:
I have not used this module, but I have looked at the code and I do not see how the previous comment claiming that all non-alphanumeric characters will be removed can be correct unless there is something terribly wrong with that person's isspace implementation. The implementation looks correct to me.