I've seen this solution to hiding unwanted posts before and don't understand how it works.

If I want to see the latest review for Syd90 for example, how does using the prefix feature help?

Ignoring that maybe you could sort by when the post was originally created, but actually I also want to see of others have opinions on what was posted.

Then again I'm on a mobile with slow as 3G. I can't easily see the prefix feature.

I'm left with just looking at the What's New posts. Not sure what the link is, but for me it was:
http://forum.aus99.com/search.php?searchid=621710