Pros: 3U is the cheapest plan I could find, and I did extensive research a few years ago.
Cons: Sometimes our calls can not be connected, so we have to try several times. However, whenever we call to have this problem looked into, they are very accommodating and usually fix the problem. We always talk to the same customer service rep. who is very friendly.
Summary: 3U has allowed our family to keep in touch with family in Nicaragua and not go bankrupt. It's well worth the occassional inconvenience of not being able to connect. I'd recommend this company to anyone with similar needs.