I would rather have the Crucial M4, but it is hard to find on sale. (Contrast it with the failure prone OCZ drives that you can buy heavily discounted right now.) I did catch the Samsung on sale yesterday along with Ghost and bought it instead of the Crucial. It is going into my old Laptop so SATA 2 is sufficient. The Crucial and Samsung drives both have good reliability ratings.
cadder - Two weeks ago I picked up a Samsung 470 Series 256GB ssd that was heavily discounted. I am going to install it this Sunday in my personal rig. It is sufficient for what I do. I'd have to upgrade the motherboard, cpu, and ram for SATA 3 6Gb/s capabilities. I don't want to do that. Instead I'd rather be satisfied with the 470 while I wait and see how the migration from SSD to PCI-e 3.0 works out.