Hit-Booster sells itself on it's site as being an amazing new traffic boosting program that can bring thousands of free hits to your site in a matter of minutes.
What the program actually is is an auto-surf program that works with start-page and surf based traffic programs like TrafficSwarm and ILoveClicks. Before you can use Hit-Booster you have to sign up to at least one of these sites. You then enter your unique URL (the one you would set your start-page to in order to earn credits) into Hit-Booster and start it running. It will then basically keep revisiting that site every 30 seconds or so earning you credits that will be converted into exposure for your site in TrafficSwarm etc.
However, the use of this type of auto-surf program is classed as abuse by sites such as TrafficSwarm and can lose you your account. They also devalue the whole system as, although using Hit-Booster might earn you loads of new exposure for your link, the majority of the time it will only be seen by other auto-surf programs such as Hit-Booster making it a pretty pointless exercise. Before long, the use of these auto-surf programs will low clickthrough ratios so much that people will abandon the startpage and click-trade style sites.
It's interesting to know that the official manual for Hit-Booster contains links to many of these sites, supposedly as a handy way for users to go and sign up.
However, all these links are affiliate links that, I assume, belong to Hit-Boosters makers. When you sign up and start using their program, they get credits added to their account thanks to you being their affiliate. Effectively, you will be risking your account by using the auto-surf program whereas they are legitimately getting loads of free credits thanks to you. On some of the clicktrade programs they might even be earning money by getting you to sign up through their link.
In conclusion, I would advise you to save your money and not buy this program. Auto-surf programs have been around since shortly after sites like TrafficSwarm were started and Hit-Booster is certainly not anything new or unique. By using it you will be breaking the rules of the sites that you belong to and will be wasting other people's time and effort by letting auto-surf programs ruin the effectiveness of programs like TrafficSwarm.