That's a good comparison.

Yep. Same reason for not putting the DVD drive in there either. Oil interferes with the spinning of the discs in both cases.

Even if you're not using mineral oil. They make excellent additions to any computer. They use less power in laptops, speed up both desktops and laptops. An SSD can breathe new life into an old computer. The prices are also lower now:

64GB Crucial M4 - $70
128GB Crucial M4 - $120

I got mine for double the price. I've bought over 10 of these drives now. They're fantastic. I have both the 128 and 64 in my personal computer. I use the 128 for Windows 7 and other programs, while the 64GB SSD is fantastic super speed workspace for virtual machines and such.
Most people use very little storage space in an office setting. Most of the stuff is on the server and that's still not much data. Having low capacity SSDs in the clients should be no problem. I think it's funny people pay extra for the 1TB or 2TB drives at the Dell Customize Screen but they haven't even filled up 10GB yet.