At Shop Direct we’ve implemented Software Consult's Performance Stub in our performance test environment. It stubbed out a 3rd party web service for product recommendations which receives millions of requests per hour. It did exactly what it was designed to do, it enabled us to get a better picture of our websites’ performance before our sales peak. We would recommend Performance Stub to any companies serious about performance testing.

Simon Holland Head of Test and QA, With more than 1.8bn in annual sales, Shop Direct are the UK's second largest online pureplay retailer.
http://www.shopdirect.com