While it is true that de-fragmenting an SSD drive will reduce its life span, doing so achieves absolutely nothing. It takes no more time to access data a the beginning of the disk than it does at the end because there is no mechanical drive head to move.
It takes the same few nano seconds to address data that is right next door as it does to address data at the other end of the disk instead of the micro seconds it takes to move a drive head.
The only disadvantage with an SSD is the price, they are still on the expensive side. However, having said that, they have a lot going for them, especially in laptops, Because there are no mechanical parts they are far more robust and can stand a degree of rough handling that would kill a conventional drive.
Also because there is no motor that needs to be kept constantly spinning, the power consumption is considerably less. I reckon that in a couple of years time SSD drives will be standard issue on laptops followed by desktops when the price begins to fall at it surly will.
I have recently installed an SSD drive in my laptop and besides the de fragmenting rule it operates exactly like a mechanical drive. Here is a couple of links to two major memory manufactures who also do SSD drives you wont go far wrong with either of them