Using Template Toolkit 2.19 on CentOS. I don't know if this is the package provided by CentOS, or the library itself.
I have issues with the fact that there isn't good error handling for cases where the attributes don't exist on a hash.
Numerous builtin methods simply don't work, while other inexplicably do. ie. first works, last does not.
It does have a good plugin architecture, and numerous helpful tool, filters, etc. Unfortunetly this does not make up for misleading documentation, and noticable lack on error handling in numerous cases.
For me and the people I work with TT has been an exercise in frustration and lost productivity. If we hand't inherited it along with a large number of templates, I would have long ago ripped it out and replaced with something else.