OCZ is the
lowest-cost brand in SSDs. Look at any shop listing SSDs, you'll find OCZ at the cheap end of the list.
It is virtually certain that OCZ uses bottom-of-the-barrel Flash chips and
controllers to be able to sell SSDs that cheap.
I don't know what the failure/RMA rate is, but probably closer to (if not actually at) a double-digit percentage, than both you and OCZ would like.
OCZ also pulled a fast one not so long ago: The Vertex 2 series was changed to use 25 nm Flash chips without changing the product code
Benchmarks were not quite the same with 25 nm chips (most benchmarks slower, a few slightly faster), and endurance is likely to be a low single-digit number of years, depending on how much data is written to it.
I wouldn't trust a SSD from OCZ with 25 nm chips, to last over a year.
25 nm Flash chips use a larger percentage of spare area to compensate (though I suspect far from entirely) for the reduced endurance from the smaller die-size.
With the new 64 Gbit chips with an even larger spare area, that meant a somewhat smaller Vertex 2 than advertised; not quite the, for example 120 GB ( 120 billion bytes), but only 115 GB (in BIOS).
After the news about it spread, OCZ now offers to swap drives, but still to ones with 25 nm, just not 64 Gbit chips, instead double the 32 Gbit chips so the capacity is actually 120 GB, primarily to help customers with RAID setups, but that's basically too little, too late.
I am NEVER
buying a OCZ SSD - that company is only interested in making money and now that they've started to screw over their customers to do so, I'll bet that company goes the way of the Dodo in a few years.