Yep, controller failure/corruption risk is a big draw-back (although you can still recover from such error by just buying a new chassis, but it then becomes a bit more expensive). Fortunately, RAID controller failure/corruption is nowadays almost non-existent (just try to look at the thecus/synology forums, not much people are complaining about these kinds of problems).
For the performance part, you are partly wrong (or partly right, as you wish
🙂). With RAID-5, and for reading scenarios, you get almost the same level of performance than RAID-0. But for writing scenarios, you get a slight performance hit, as the controller has to calculate the parity bits for the error recovery algorithm.
Link (sorry, I have more reference in french, this is the first one I found in english through Google):
http://www.raid-data-recovery.net/raid-5.html
Of course, as we are talking about network storage, the main limiting factor for the throughput will always be the transfer through ehternet, so performance considerations of the underlying storage system shouldn't really play a role in the decision process.
Mmm, the reason I switched to Macs is that for a given amount of money, it was the most polished and professional system I could get. PC or Macs alike. Most people still using Windows just say they don't care that MacOSX is running on top of Darwin, that it's Unix-based, ... Even if those assets that non-technical people are likely not to understand are what makes MacOSX "just works". Most people just use Vista, MSN Messenger, IE8. It works, and they are sick of having to spend all their time considering switching to Macs. Sorry, that was a bit a of a joke there
🙂
But my point is that most good NAS (like the Thecus N5200 Pro, but there are other systems made by Synology that are of the same quality level or even better) have the same feature set, while being more professional/polished.
The funny thing is that you are saying "hopefully 3.0 fixes the current TM backup issue". TM backups already work with the Thecus, no need to wait for a future 3.0 that might or might not restore full compatibility. All other features you quote are also supported by the Thecus and other good NAS (centralized file storage, access to those files over the internet over HTTPS and built-in dynamic DNS, streaming over Firefly).
To quote most people experience with the Thecus 5200: you buy it, you plug it in, you insert the hard drives, and it just works...
To sum it up: for me, a forum is a place where opinions can be gathered. In my opinion (still waiting for more opinions though), HP MediaServer solution is a good choice when compared with a single USB2/Firewire external harddrive. But when you compare it with the other solutions available on the market, it just doesn't cut it. Kind of like when you compare Windows to MacOSX, it just doesn't cut it.
I'm posting this not because I think it's "hype" to have a NAS setup, but because I believe that I can help some people and teach them something they don't know (maybe not you, as you seem to know what NAS and RAID stands for). And at least these people will make an informed decision, even if they decide to buy the HP MediaServer (after all, some people are also buying Windows OS
😉).