Unfortunately, most of these programs don't really do that much; this one is no exception! While I did notice some slight improvement, not anything to write home about. Save your money.
The software developer responded to this review on Apr 23, 2008:
We are sure that our description is accurate and the software really makes a difference. The demo version is running in limited evaluation mode, but is free to download and try. For full 3rd party professional reviews and registered users opinions we recommend a simple search for "speedconnect" on Google. Thank you for your interest in SpeedConnect Internet Accelerator!