Hardly worth the cost Kappy? That's a pretty big statement 🙂 The cost issue really is for the individual to decide about isn't it based on their requirements?
Personally, given the type of work I do, I would never, ever go back to a physical drive for OS & Apps.
The performance difference between an SSD equipped machine and a traditional physical hard drive is night and day.
There's some videos on an old blog article of mine here:
http://www.markc.me.uk/MarkC/Blog/Entries/2009/9/2Crucial_M225_128GbSSD.html
I'm not convinced I'd splash 1k US$ on a 512Gb unit though - I wouldn't use an SSD as a general storage device given that OSX currently doesn't support TRIM. You'd end up having to write-erase it every 6 months.
My unit has a 128Gb SSD in it, and a 640Gb SATA unit for storage, the best combination IMO. I don't miss the DVD in the slightest.
SSDs have to be the future of storage - maybe not in their current form, and certainly not at the current cost.
Are they worth it? It depends really doesn't it?