should I change my 5400rpm hd to the new SSDs?

I read an review on using SSD drives as a primary laptop hard drive and it indicated there were more beach ball events and they lasted a fair amount of time. Please look at the video on the Seagate site below to see a rating of the types of drives.

http://www.seagate.com/www/en-us/product...

I'm in the process of doing that myself. I just bought a 240GB Mercury Extreme Pro SSD new, off of eBay, for $400. Same as the one here:

http://eshop.macsales.com/shop/internal_...

I'm going to try to do a complete backup of my current hard drive onto the new drive via SuperDuper, and then make the swap and hope it starts up with everything in place. We'll see.

I just put a 120Gb SandForce based drive in the MBP. WOW! What a difference.

I've got the iMac for any serious work, and actually do need every hour of battery i can get, so 120Gb ended up being enough space and a 2nd HDD/SSD would just kill the battery faster.

I use a LOT of my archived video & Pictures, and before I even learned about a SSD, I purchased a TB drive for my 17" MBP unibody. Now being that I really don't need the OD (I have an external Lightscribe as well, as the author), what size SSD should/could I place in my OD spot? AND--do I run the OS from the SSD, and then just place any media, onto the TB drive?

Now, with that question asked, where do my documents, desktop email etc. go onto? Furthermore, when I do a back up of my Time Machine, what drive does it back up. Sorry for sounding like a tool, but this is honestly the first time, that I am hearing of the SSD drives. The storage capacity just sounds so small,,,so I guess you can say that I just don't "get it".

I just want to know what is the smallest SSD drive that I can get away with to replace the OD, and use the internal TB for any storage needs.

Thanks!