I am not yet familiar with the OCZ Agility series so I can't comment about that model.
I am cautious about purchasing an OCZ ssd. In a recent survey of hard disk and ssd failure rates and returns, OCZ wound up with the worst record for ssd's. (Intel was the most reliable)
Earlier today I was over at the OCZ web site and forums. OCZ changed from 34nm to 25nm NAND in their Vertex 2 series ssd's without any sort of press release or major announcements. In addition OCZ did not change the model name, product number, or description to reflect the switch. The Vertex 2 is still SATA II (3 Gb/s) too. Seems the ssd's with 25nm NAND are not performing to customer expectations. I got the impression the new 25nm Vertex 2 performed worse than the original 34nm Vertex 2. OCZ may have been first to market with ssd's using 25nm NAND but that's all they can claim. Their customer service is getting slammed too.
Intel is also having problems with 25nm NAND but thy took a different approach. Instead of charging ahead they simply delayed verything until they were able to have production quality 25nm NAND. Their new 510 series ssd's which will be released this month will still use 34nm NAND but the drives will be SATA III (6 Gb/s) capable. I guess Intel decided to play it safe.