A combination of ATTO, AS SSD and CrystalDiskMark should give you a good idea of how your SSD is performing. ATTO is notorious for giving glowing results, because it tests the drive in the most favorable conditions (this is why all SSD manufacturers base their advertisement on it), while AS SSD does just the opposite and gives much lower marks ... More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.