Ask HN: Reliable International SMS gateway with API (other than Clickatell)?

We have been using Clickatell's API to send text messages to US & International users for ~ 1 year. However, their US gateways have been down for a few days, meaning all of our text messages to US phone #'s are being rejected! For 3+ days, their customer service has been: "We know this is bad, we're working on it". This is a problem for us.

Can anyone recommend a bulk SMS gateway with solid uptime performance that offers a web API? Nice to have would be web-based reporting and a Ruby API library.

Has anyone used http://www.redoxygen.com/pricing/united_states/ ?