I personally know of (3) OCZ Agility 1 30GB drives fail, 2 on Linux, 1 on Windows.
OCZ Agility -> Intel SSD Image -> Distro Upgrade to Fix Corruption
The failure mode on one was file system corruption like an HDD but check disk would find problems, fix them but error out and another run would find different errors. I was able to image that one off to an Intel X25-V (Value) G1 40GB SSD then did a whole Ubuntu distro upgrade that basically overwrote pretty much all the important files on the system to downloaded good ones and that took care of the corruption and any problems from the previous hard drive. System is still running Asterisk PBX to this day without any errors surprisingly. I'm still a little amazed at how simple this recovery was and that there were no issues after distro upgrade that seemed to fix any corrupted files. I sent the failed OCZ drive back to my friends after fixing their PBX with with instructions to put a bullet through it instead of sending it for replacement, and I was being serious and literal and it is likely that they did just that.
Another failed with inaccessible and unbootable from Windows XP. The last one just kernel panicked disappeared from the BIOS completely. Both went back to OCZ for replacement and new ones showed up. I told the folks to not open the boxes and sell them on eBay and instead buy Intel X25-M or -V series drives to replace them.
I still have a sealed OCZ Agility 1 30GB in my house and I posted it on eBay twice and nobody wants to buy it. I guess the word is out that OCZ SSD has shit for reliability. Newegg reviews are just full of failure reports. Even though Anandtech keeps reviewing these OCZ Vertex 2, 3, 4 series drives and praising them for performance I stay the hell away from OCZ as a vendor due to the massive amounts of complaints of failures people report on these.
As a side story, I also got burned by a performance grade OCZ 550W power supply with unstable 12V rail that wasn't even heavily loaded that would drop to 11V for no reason and destabilize my system causing weird behavior. Switched to Corsair TX750 after that and weirdness went away.
Intel SSDs - 3 Generations Going Strong
I still run an Intel X25-M G1 80GB in my laptop for a few years now without issues that used to be a desktop drive. I have an Intel X25-M G2 80GB at work and it's still working fine. I also have an Intel 320 (G3) 160GB as my new desktop drive andI applied the firmware upgrade to it that was available to fix that weird lock-up 8MB issue that was reported. I also have that Intel 320 40GB in my Ubuntu XbmcLive HTPC in my living room and another Intel X25-V G1 40GB in a friend's Ubuntu based Asterisk PBX system running just fine.
Love Intel for their SSD, never had an issue and I'm quite happy with them and the engineering that they did on the drives. Looking at the return numbers Intel has very low return rates for SSD, somewhere within the neighborhood of 1% and most of those were related to the two firmware bugs found, the one in the X25-M series early and the other the 320 series.
Intel 520 Series and SandForce SF-2281 Controller Firmware
There's a nice little story on Anandtech when Intel was choosing the new SandForce SF-2281controller for their Intel 520 SSD product line that they ran so many tests and did so much engineering on the drives that they came up with firmware updates that they gave to the vendor due to the issue that they discovered. Too bad that later on Intel found out that the controller can't do AES256 only AES128 encryption and it offering refunds for those that care about it.
All of my Intel SSDs are about 2 to 3 generations behind and still use the old Intel controller that's limited to SATA-2 3Gbps speeds but I'm okay with that because that's what my motherboards support so the SATA controllers and SSDs are all technology level matched for the generation that they were built in.
Overall SSD View on Reliability and My Intel Fanboyism
Still, to me the SSD speeds are all about random read/write/latency times and not about sequential throughput so I don't much care about SATA-3 6Gbps speeds until I get a whole new system upgrade in a few years and replace the whole CPU/MB/RAM combo and possibly SSD if there's a need.
I keep seeing all of these Samsung, Plextor, Micron makes doing pretty good job with their drives and OCZ Vertex 4 kicking ass in all of these benchmarks but I'm a bit worried about how much actual engineering is going into these product lines so when I see the Intel 520 series in the 3rd, 4th, or 5th place behind them by a few percentage points and know from past experience and also articles that Intel values reliability above speed and spends the time on engineering their firmware well I tend to steer people toward Intel 520 line even though it is more expensive than the others.
Perhaps I'm a bit of an Intel fanboy on SSDs but I've had good experience with them and while SSDs were out for a few years I never switched to any of them until the first Intel X25-M G1 80GB drives came out and were well received on performance and overall engineering. Only at that point I felt it safe to give SSDs a try and I've been one of those folks that followed SSD developments heavily with Indilix, SandForce, Intel controller coverage by Anandtech and other online publications.