TC cannot repeat from non-apple router. Although that is not quite true WDS is so bad and so insecure you would never in a million years do it. if you have a security router like Sonicwall.
It would be like building a castle with a moat and the drawbridge can never be pulled up or the gate shut.
If you setup the TC in bridge and as an AP plugged into the sonic wall by ethernet.. that will work fine. You can setup a roaming wireless network.. which works well on Macs but generally PC fail totally. That is only relevant to laptops and portable devices though.
PC will be able to use the TC as a backup target.. it is not ideal and you will generally need to play around a bit but it does work.
You should note.. a TC is not a NAS.. it is primarily designed as a backup target for Mac Laptops with Time Machine. That is why the combo of wireless plus hard disk.
It is a dumb box.. really a hard drive hanging off a wireless router.. (only it is inside it.. well sealed inside).
It is slow.. fast enough for wireless clients.. but it is a single green drive.. no raid to mirror.. no esata or way to extend the drive.. no JBOD .. when it runs out of space.. it is out of space.
But principally there is no internal backup.. as a place to store files.. it stinks.. you will have to setup a manual backup.
If you want a NAS buy a NAS and plug it into the fastest router point you have.
To extend wireless use a proper repeater if you have to.. repeaters are never a great idea.. it is much better to use multiple AP's tied back by ethernet.
Cost wise the TC is very hard to beat if it suits your function.. but it has a short lifespan.. do not trust it after 3 years. It is sealed.. if it dies in warranty it is replaced.. no data will be recovered.. after all .. it is a backup device.. there are no parts available to fix it.. power supply being the chief thing that goes wrong.
Read in google a bit.. dead time capsule
You will see what I mean.
