UPDATED 02.01.2015 (see below for update)
This was a terrible result and customer support is none existent.
I went on holiday for two weeks and needed internet access for my work. I contacted them and told them I had a Verizon Iphone that permitted international data roaming. I was told that Verizoin doesn't really have an international data roaming sim, and that I would have to go to Verizon and have them unlock it with proof that it was unlocked before they would send me SIM card. (keepgo if you are listening, the ID for this email is 16165). I was then told I could get a MIFI device (for an extra fee) for that would do all I needed. I ordered the MIFI.
I was then told, that the MIFI I ordered couldn't be ordered, but that for an extra fee (again) they could upgrade my MIFI. I upgraded.
I also requested, pursuant to their information on their website, to request an additional battery so that I can use the device all did. I did.
I then got the MIFI and it didn't have an extra battery and the device wouldn't turn on (I believe the battery was busted). I called their "support number" and they said that they couldn't help me, but that they would forward my "concern" to the correct department and they would email me. Of course, I don't have email because that was the purpose of having the MIFI internet access in the first place. As such, each day I had to travel to a city with wifi to get any information from them, and then get the reply the next day since they would not reply right away. I was told that they would send me a replacement MIFI in France, but I never got one and they never responded with any information about sending it. (again keepgo, that email id is 16856). After several days, I took out the sim card and put it in my phone and it worked. But did they reverse the charge for the MIFI that didn't work? No, that would be what you would expect from a good business.
So, the short story is that you will get upsold, and then they won't deliver the service, and if you have problems, they won't be there to help you. If all goes well then I am sure the service is fine since they are just reselling another networks access.
UPDATE:
After some emailing with customer service, Keepgo agreed to refund the costs of the MIFI that did not work. I updated the review to "ok" since at least they reversed the charges, and did provide a sim card that worked with my cellphone.
UPDATE AGAIN:
In January 2015 I got an email offering to refund all the charges with the Keepgo product during my trip. I checked their website, and it appears that Keepgo has changed its process. First, they don't send you used MIFIs anymore. The price is higher, but it appears that you get to keep the MIFI and use it for future trips. Second, and in my mind, they now offer support by phone. That was a big problem when I was using the device, they would only offer support by email so you would have to go to a wifi spot, email them, and then wait a day for a solution. read more