The entry page either lets you view all the public folders on the device or enter the administration area. Additional users can be added and assigned access to various folders on the drive, which are hidden to those without permission to view them, and quotas can be set on a per-folder basis.
Transfer speeds were little different from what you might expect averaging out to 26.8MB/s read and 20.1MB/s write from Windows 7 and 48.7MB/s read and 28.6MB/s write using the FileZilla FTP client. That falls in line with the similarly priced QNAP TS-409 so there's no complaints to be had on that front.
The ix4-200d has a couple of consumer-centric features, even though its target audience is business users. The foremost of these is a built-in uPnP server which will stream files to any compatible media playback device or software. I had no problems using this with my PS3, Xbox 360 or Windows 7 laptop using both iTunes and Windows Media Player. There's also a very basic BitTorrent client, which works fine but lacks abilities, such as encryption or scheduling which I, for one, find very useful. I doubt many small businesses would encourage typical torrenting activity over their networks though and I likely wouldn't have noticed or bemoaned the features outright omission.
Better is the ability to mount iSCSI drives from the StorCentre and the VMWare certified status the device holds. A comprehensive amount of backup options are offered by the ix4-200d itself if just holding data in it isn't good enough. As well as transferring to and from USB devices you can have the NAS pull data to its own storage from another network location or even transfer from one to another. It's an unlikely requirement but if you do have it then Iomega won't disappoint. RSync and Time Machine support caters to Linux and Mac users respectively
Online access is also possible but the feature isn't as well realised as it could be. 12 months free remote web access is offered out of the box using TZO which gives you a choice of either a whatever.IomegaLink.com or whatever.MyIomega.com address to connect to which makes it a bit pointless as most routers offer dynamic DNS configuration anyway and there's no facility to use your own domain name without a paid-for TZO subscription.
There really aren't any major features missing from the StorCentre ix4-200d given its intended market and those offered are excellent save for a few niggles here and there. Nor is the pricing for the 2TB and 4TB models anything to baulk at, though the 8TB model is dauntingly expensive.