Plivo offers essentially the same service at half the price as their competitors (at the time of my switch). Good logs and transparency for SMS and customer support has been reachable for me when diagnosing reasons for some SMS messages not going through. Good SDK for implementation (I use Python but am just using the REST API for my implementation, it's been great). I don't recall any downtime for the features I use in the six years that I have been a customer of Plivo which is pretty fantastic. Review collected by and hosted on G2.com.
At first I didn't think the success rates were as good as my setup on a competitor, HOWEVER after some tweaks on my account with support (they even helped me choose a good area code to send my texts), and helping my SMS messages stay compliant, success rates have become close to 100%. Review collected by and hosted on G2.com.
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