Cons: If you have the slightest noise on your phone like forget using this for fax. 80% of faxes will fail to send or receive. Extremely frustrating trying to troubleshoot this modems fax issues. I tried 3 of these all brand new and they all had the same issue. Ended up getting a MultiTech MT9234ZPX-PC...
Summary: I have not used it past it's basic functionality of sending a few faxes, but it does what I need it to. I imagine that the software you use will make a big difference. I am just using windows fax option for now.
Pros: Compact, Good Build Quality, Can travel with it
Summary: Some people ask why dial-up? It's so ancient. Answer: sometimes there's nothing else available, but wow, is it slow! Still, it can be faster than driving to town for some wi-fi.
Pros: Works great. I got this to use with a Lenovo S12 Netbook that I had migrated from XP to Linux Mint 17. It was plug 'n play all the way. GNOME PPP is the dial-up software. The netbook lacks its own modem, and having only dial-up at a remote cabin, I didn't want all the baggage that my WIn 7 laptop...
Summary: My old Toshiba laptop had an internal modem. I was able to fax documents. That laptop stopped operating. I went out and purchased a new laptop. After checking out my new laptop, I noticed that it did not have an internal modem.
Summary: If you don't care about hearing the dialup sound through your PC, then give this 5 eggs.
Pros: Works great.
Cons: Doesn't play the phone line sound through the PC's audio. I really rely on this to know when the dialup is having trouble connecting, line is busy, noisy, etc. All the other USB and internal modems I've used have had this feature, so I'm downgrading it.