... I've ever seen! Really intuitive GUI - very like Apples Mail.app.
I licensed and used this application since about a year. It works very well and stable: Apple Addressbook access, one fax to multiple reciepients, attachments, create cover pages from external apps (f.e. MS-Word), ... Receiving faxes without any problems.
I use it on my TiBook 400 with MacOS X 10.2.6.

It would be nice to easily switch between different preference settings. F.e. from my home office I've to prefix dialing with the digit "0". From "on the road" I use my mobil which uses some different settings.