Depends what you're doing... For big bad light systems, you're probably going to need real sliding door hardware.

Cost wise, the reason this stuff is so expensive, is it comes in long lengths; and you're probably going to be paying full bore for shipping (as most places order it on demand - few if any will stock it); LTL truck freight of 10' lengths of steel is not cheap.

For those in calgary looking for this stuff - use this guide http://www.rwhardware.com/hardware/HardwareCatalog.pdf shoot me an email with your wish list, and I'll see what I can do (we stock some of their sliding door parts, and order other parts by the truckload from this manufacturer - thus sometimes my pricing is much more gooder).