Thanks for the feedback. Yes, it is a WHS for my home LAN. It will backup two PCs only. I will typically want to transfer large files (>8GB) or a large # of small files to this server and want something that can handle the transfer speed efficiently. When this is happening, I will probably be the only one writing to the server.
Also, WHS appears to be trashing the disk alll the time "balancing storage" and so forth.... So, knowing this info, do you think the samsung should still be able to do the job faster?
Yes, that is a critical piece of info. How many users will be accessing the file server at the same time? Are they heavy users with constant datastreams or just occasional access (even 1 request every few seconds is occasional at best). If it's for a small office the Samsung F1 will probably still be faster, but if you've got 10 or 20 concurrent sessions running then the ES.2 would probably be faster.
edit: just noticed you mean a WHS box. If this sucker is just serving your home LAN, the F1 should be faster.