Thunderbird vs Claws Mail

[Peter Ehlert <peter@sdi-baja.com>]

I am a long time user of Thunderbird. No real complaints, but the GUI 
has been slowly been changed.
lately I have been struggling with that, trying to get it to be My Way. 
Minor success.

also the .msf files have gotten Huge and that hinders rapid and easy 
backups.

In the process I would like to do some housekeeping, fix a few filters 
and rearrange my copious folders.

Question: do you folks recommend migrating to Claws Mail?
the initial look and feel seems to be familiar and comfortable, but I 
know little of the history and stability.

secondly, will I be missing the basic features such as Filters?

thanks in advance.