I kind of prefer DAT drives because: (1) the tapes are super-cheap compared to any other media, so you can afford to buy them and replace them. Any magnetic media is only good for 50 to 100 uses max, and at $5 to $10 a pop, DAT is great, and the other stuff if astronomical; and (2) the device, if cleaned occasionally, will last long after its size is too small to be useful, as the size of drives marches on.
Also, I have read some stories critical of the error-checking in the Ecrix drives -- have no experience, but I'd do a web search before buying one.