We were asked to beta test PriceMinder months ago. We used it for 3 weeks before deciding to turn off RepricerExpress. We switched to PriceMinder because it is faster to find and update listings, it includes useful statistics and navigation on the dashboard, and because it costs less than most of the other repricers. We also thought about using Amazon's repricer but found PriceMinder's features to be worth the cost and the developers have added several features based on our beta test feedback. PriceMinder is still beta testing and could use some additional on-line documentation and a little more work on the web site to make it "pretty". Bottom line - PriceMinder has been flawlessly running our repricing for months, we switched from RepricerExpress and pay less for the service, and we are very happy overall with PriceMinder and the developers.
We know other Amazon sellers and have recommended PriceMinder to them based on performance and cost.