The Verizon Mifi (made by Novatel) is a combination of a great, hugely convenient product and some annoying quirks.
However, first you need to set your expectations. When you use this, your PC, iPad, Smart-phone etc. are all sharing a "3G" link to the internet, which is basically a cellular line. The speed if this connection is whatever "3G" means in that particular place at that particular time - but if you expect Mega-bits per second, you will be disappointed - that usually only happens in Verizon ads.
That said, this is EXTREMELY useful for business travelers like me. When you need to get or send an email, attachments and all, or check a web-site for some information or updates - you can be sure you WILL be able to do it. Even while in motion 9and yes, it does work while in high-speed motion, if you are in a good coverage area), and even when visiting a company that does not have any arrangements to give visitors internet access.
Operation is dead simple - you turn it on, and connect your PC/iPad/Whatever to the WiFI network as usual. by default, the network requires a Password, and supports up to 5 simultaneous connections.
The battery seems to last about 2-3 hours, but in most cases, you can power it up, synchronize your email, and power it back down, with each session lasting openly a few minutes - which will allow this to give you a day's worth of service.
Now for the "annoying" part
1. When you connect it to a charging source, it turns on, even if you don't want to. to be
clear - you can't charge it without having it broadcast a WiFi network for the entire duration.
Aside from this limiting where you can charge it (e.g. not on a plane) this is simply
stupid - If i want to charge it, broadcasting a WiFi signal DISCHARGES the battery,
making the charging time longer. I find it strange that the On/off Button does not work
when charging. I am told this is by design, but I still consider this a bug.
2. If you connect it to your PC to charge, it will go into an "I'm a cellular modem" mode,
providing service to just the PC it is attached to, and not putting out the WiFi network
which is its main function. This is probably a conscious choice by the designers of this
product, and sort of makes sense - you may WANT to service only a single PC, and not
serve as a WiFI Access point. However, in practice, you want to charge it when in use,
and having to connect it to a separate AC outlet, and lugging yet one more power-adapter,
where it SEEMS the device is charged via a USB port, of which you have several free
in your PC is annoying. (Note some Internet searching will tell you how to change some
internal settings to prevent this). The product could benefit a lot from having one additional
"mode" switch instead.
3. It is quite finicky about what can charge it. If you want to use some universal AC-to-USB adapter,
you will find that most of them do not work. if you want to try it, do lots of research before you buy.