Not sure why people are shting on doing a PRL update so much. If the updated list actually has any changes that impact your area, you could indeed see results. If not, you've lost nothing.
And, as has been mentioned several times here, there obviously has been an update since this phone was launched since many of us were on an older version.
And clearly people in Altel areas need to look into it further, since it seems the 228 update still doesn't add all of their towers and there is more they need to do.
Is it going to make your signal stronger to the existing towers you connect to? Of course not. But, if it adds new towers in areas you frequent that were not in the previous list, you could certainly see better signal in those areas.