Can you elaborate on the 3rd party DE stuff that disappointed you?
Tried out both Stablebit Drivepool and Drive Bender.
When editing files via my network (reorganizing a huge consolidated media archive on my NAS itself via my PC) it kept giving me errors on moving files, or deleting folders. Turns out that was mostly due to Windows 7 dumb thumbs.db caching (I think), but still the performance was pretty sub-par-- seemingly slower than software raids I have used in the past. Oh yeah, and if you edit anything via a network share (versus like remoting into the WHS machine and moving/renaming files directly on it), I had to constantly keep hitting refresh/f5 for ANY changes to show up in the folder. That alone was annoying me enough to give up on both, as I move/sort a lot of files on my NAS all of the time.
The good about DE though, besides being super easy to set up (I have 15 years technical experience so that ease of set up was a bit wasted on me, but probably is great for others) is that all of the data is kept as normal files on each drive, but just in a hidden drive pooled folder. Therefore if you pop out the drive and plug it in via a SATA<->USB connector, it will see all of the files. Definitely a plus over raids, but all of the above drawbacks turned me off enough that this wasn't enough of a selling point.
Plus, I kept my old super low power headless ASUS EEE Box as my downloads/remote desktop-from-work (for proxy reasons) machine, as I'd rather kept that on 24/7 @ only 10w versus the Microserver @~50w with 5 HDs. My original idea was to toss it and consolidate it along with this NAS using WHS. However, I am wasting that drive space I have WHS installed on by not using WHS, so I figured I might as well put in a 5th 2TB drive, get the same ~7TB drive pool working size that I had from my 4x 2TB drives via DE, only add some raid parity to it too.
Also FreeNAS boots quicker when my girlfriend turns on the NAS to watch some stuff off of it, if it had been off. (~90sec for FreeNas, like 3+ min to return from hibernation from WHS). And believe me, that extra doubled amount of time definitely is noticeable by her and her impatience to want to watch some media right NOW :]