regular people its not worth it IMO , get a top notch third gen mechanical drive youll be happy.
Pretty sure a "third gen" mechanical drive would be something sub 100MB in total capacity and 1MB/s performance from thirty years ago.
The other problem with SSD's is that their performance can vary wildly from one model to the next. You can buy a crap SSD off of newegg for cheap that performs badly, or you can pay a ton of cash and get something better such as one of the Intel X25-M G2's. I have two SSD's right now and while they perform similarly on the ATTO HD benchmark, the "user experience" between the two is vastly different.
They can also perform WILDLY differently depending on system, setup, and drivers. If you have a 60GB+ Sandforce drive they will run ATTO at 285/275MB/s read/write speeds very consistently (+/- 3MB/s) because ATTO is really compressible data.
That being said, I installed a new 64GB Sandforce drive in an Intel 3400 series platform and then installed Windows 7 x64 out of the box. 220MB/s read 185MB/s write.
I then hooked the same drive into a laptop with a C2D T9300 and saw <150MB/s read/ write.
Finally, I hooked the drive into my main system where I knew the ICH10R was set to RAID mode and recent Intel RST drivers were installed. Performance was back to 285/275 in ATTO.
Point is, you do need to set them up properly.
And to anyone that thinks that a properly setup Indilinx, Sandforce, Micron C300, or Intel X25-V/ G1/ G2 is not faster than a traditional disk is absolutely crazy. You get more speed, albeit 1-2s at a time in non-boot scenarios. Going back to hard disks is rough. My firm issued laptop uses a mechanical hard drive and is painfully slow. Every other system I own uses SSD's at this point. And just for comparison, I made the switch to SSDs while I was running a boot volume based on
8x 15k RPM Seagate Savvio drives in RAID 5 with an Adaptec 5805 w/ BBU. The performance of that setup was light years beyond consumer raptors and 7,200rpm disks and still I use SSDs now.
P.S. Just to be clear, do not defrag SSDs.