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 brought doing too many involuntary updates over a creaky phone line.
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. I ordered the USRobotics modem and after updating my fax program on my laptop, I was able to fax again. The external modem faxes accurately and very quickly, utilizing my USB port.
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.
Cons: Used the FaxTalk server and had trouble. Worked with a tech at GetFaxing (he was great) and recorded the fax tone being produced and sent it to me and I can hear the distortion. Replaced with USR5638 internal and problems are gone
Summary: 1. I haven't tried FAX with this unit. 2. The Rosewill RNX-56USB is less than half the price and may well be the better overall deal. I'm seriously thinking about buying a Rosewill also, as my only other similar/small unit is an old Zoom unit (7 years?) OTOH this USR unit gets better owner reviews. And given that it costs twice the Rosewill suggests that it may be worth it.
Pros: 1. Good dialup performance for a USB powered unit. I'm a fan of US Robotics for 10+ years, back to the great V.everything modems. I still have one, but haven't tried a direct comparison. But the V.everything is not mobile, whereas this unit is. 2. It runs at reasonable temperature. A prior review raised this question, and high temps are NOT an issue. 3. The included CD/software is useful. As is the included (cheap) telephone cable.