Rated 5 out of 5 stars

The add-on does what is supposed to do and is apparently very well and professionally maintained. That means also, that the limitations are known, and for sure there is always room for more scope of functionality, but I prefer the approach like here that it just works well for the stuff it is built for. On my personal wish-list is compatibility with Exchange filters, but I guess this is not that simple.
The fee is fair and justified.

This review is for a previous version of the add-on (38.0.1159.1-let-fixed).  This user has a previous review of this add-on.