1. Faster data transfer.
2. Faster data access.
3. Somewhat less heat and power usage.
4. Less mechanical stuff to break.
I've been using an SSD for some time now, and it really has sped up my computer. Yes, it boots faster, and also applications come up faster. Applications that use the disk or access the disk run faster. No problem with disk fragmentation, and other sources of mechanical disk-related progressive slowness with SSD's.
However, the other side of the coin, right now, are the wear-leveling problems. Given the fact that the individual storage units on an SSD have a limited life, you need to make sure that usage is spread over the whole device, rather than concentrated, using particular storage cells over and over. So the TRIM command is used to implement wear-leveling. This command is reputed to be issued in Windows 7 when files are deleted from an SSD, but I've never seen a TRIM command or noticed its effects *smile*. There's also an Intel SSD Toolbox that is used for this, but that's a more manual approach.
It is a big step to spend the money for an SSD. There are also hybrid disks out there that have SSD-type caches, and also rotating media that are less expensive. I'm not sure how they're doing. But if the money isn't an issue, an SSD will really speed up your computer, but it can't make it faster than your cpu and memory speeds will allow, of course.
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