Is replacing HDD by SSD worth it with Core 2 Duo and Filevault2 enabled Will I see some speed improvment by replacing the original 5400-rpm with a SSD on a MBP Core2Duo with Filevault2 enabled? Or it is a waste of money?

I ask this question because I know Filevault tend to kill performance of SSD on Core2Duo since this cpu doesnt have the AES-ni instructions as i5-i7 have...

I didnt find many benchmarks results...

My current HDD stats with Filevault2 enabled are (measured with XBench):

Sequential:
  Uncached Write: 46MB/s (4K blocks)
  Uncached Write: 30MB/s (256K blocks)
  Uncached Read: 15MB/s (4K blocks)
  Uncached Read: 42MB/s (256 blocks)
Random:
  Uncached Write: 0.95MB/s (4K blocks)
  Uncached Write: 18MB/s (256 blocks)
  Uncached Read: 0.39MB/s (4K blocks)
  Uncached Read: 15MB/s (256 blocks)


UPDATE:
I installed a Crucial M4 here is the new stats:

Sequential:
  Uncached Write: 153MB/s (4K blocks)
  Uncached Write: 97MB/s (256K blocks)
  Uncached Read: 23MB/s (4K blocks)
  Uncached Read: 130MB/s (256 blocks)
Random:
  Uncached Write: 93MB/s (4K blocks)
  Uncached Write: 101MB/s (256 blocks)
  Uncached Read: 13MB/s (4K blocks)
  Uncached Read: 119MB/s (256 blocks)


As you see, a nice boost even if it's only a non-AES-NI Core Duo 2.26 with Filevault2 enabled
You will see a great improvement in performance. You will lose some performance due to the encryption but you will at least get two and half times the performance of your current drive.