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How often do you use it and what for?

I've switched to tethering straight to my iPhone, been doing this since the iPhone 4. I don't know whether you are pay as you go or on some form of contract however I'm with EE in the UK and my price plan includes unlimited calls, unlimited texts and 11G of data. I often receive speed in excess of 10GB/s but have seen as much as 30GB/s!

I do pay £45/month though but as I use it daily I think it's worth it.

Sorry forgot to add, make sure that your phone company allows tethering before you use it heavily, in the early days I got away with looking at emails and general browsing for months but then tried watching a tv show one day and got stung form £40 for using tethering. I don't know how they knew but I just needed to add it to my price plan.
 
Well if you're traveling tethering really isn't an option because you are roaming. It's fine if you're using wifi on an already available wifi network but these devices are for places that have LAN but no wifi. I guess it's really hard to find a place these days that doesn't have wifi hey.
 
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