Techgage discusses what you need to look for when buying a solid state disk, you can read it over here. It includes the difference between compressible and incompressible performance figures, MB/s vs IOPS, etc.
As someone who has purchased many different storage devices (HDD, SSD, flash drive, etc.), I have experienced first hand the confusion that can come from all the numbers we are bombarded with. Manufacturers throw numbers at us to back up their lofty claims of ever increasing performance. But what do all of these things mean? Some people may give up and just get the one that has the largest numbers plastered on the box. Hopefully after reading this article, that will not be you.