I'm having trouble understanding the current offer: it looks like a single 2TB drive for 10 euro/month? Like everyone else I'd be a bit scared by the absence of RAID. And while I'm always looking for cheap storage I'm not sure what the advantage of a NAS is over a storage VPS or ftp or S3 server unless it's to serve through a dedi or VPS at the same facility. In that case the 100mbps network port is limiting.
Also while the price isn't bad, it's not that attractive compared to Hetzner storage boxes (10 eur/month for 2TB but that's RAID protected), time4vps storage vps (again raid-6, 4 euro/month for 2tb on a 2 year purchase/2x that month to month), the new Delimiter object store offer (yeah I have doubts about Delimiter) 2.75 USD/2TB on 3 year purchase, etc.
(LET offer link) Or the current Hetzner dedicated servers at around 30 euro/month with 2x 3tb drives (10 euro for 2TB without raid, but on your own dedi with 1gbps network). I currently have a Hetzner dedi and a time4vps storage vps so would be looking for comparable offers.