The best thing about this is that it can be used in any device which has an internet connection or even those devices with no connectivity at all! It's free to use as well so there are few downsides of using their service but I guess they could have given more options for payment plans if you want them instead going into credit card details each time when signing up new users etc..
But overall its good experience because we get connected from our office locations where ever needed without having access only through wifi connections provided by companies like hotels/hotels-restaurants & other places around us!!