We purchased the Spitfire Dialer from OPC-Marketing two years ago, and we haven't had any problems with it since then.
We had three other dialers, and without question Spitfire out performs them all. Customer support is outstanding. Any questions or concerns have been addressed immediately; and customization to fit our needs has been excellent.
Anyone wanting to make a commitment to the call centre industry, I strongly recommend looking in SpitFire as it will meet all of your needs.
Jason White, Landmark Services St Catharines, ON Canada