Best Load Testing service you can get
We do a lot of JMeter load testing, often over 100,000 users. We have used several services in the past, and always dealt with high cost (at times $4-5k per test), or lack of flexibility.
Redline13 has been a paradigm shift for us. We are able to run massive load tests with total flexibility and at extremely low costs (150k test was $120, would have cost us $10k or more with another service)
We have tons of options and the support is excellent.
Frankly, they are the best out there, worth every dollar.