OCZ just switched from 32nm to 25nm technology for their Vertex2 series SSDs.
According to storagereview.com, these new drives lack the performance of the previous models:
They are slightly slower (in real world tests), and they have less capacity.
Life time decreased also, which seems to be a feature of these new 25nm chips.
OCZ is heavily critisized for selling these drives with the same product name and model numbers, so potential customers don’t know what they get. For an extra fee, you can trade your 25nm Vertex2 for a 32nm version.