Except for external appearance stuff and the detachable cables, it's identical to a Filco. The only differences I've found from my previous tenkeyless mj2 are:
1. Detachable mini USB to USB cable and mini usb to PS/2 cable. (point rosewill)
2. Logo(half a point Filco)
3. Painted plate (wash)
4. Raised legends on the key caps (thicker infill?) (wash, both are thin flimsy junk caps, but if it IS infill on the Rosewill, it will likely be a bit tougher than Filco's trash keycaps)
5. No rubber "condoms" on the fold-out feet. (point Filco)
*6. Numpad present.
*7. MX blues
*options that exist for Filco models, so are not really relevant.
So on those few small differences a Filco comes out a bit ahead IMO, but not enough of a difference to pay a premium. Very minor stuff. If you are considering a 104 key Filco with blues, save yourself the cash and get a Rosewill. (other Rosewill switch options in the works) The Filco logo is not that much better than the Rosewill, and I hate the Rosewill logo. The saved money can go toward quality PBT or doubleshot ABS keycaps that should be standard on the Filco at its price point!

Overall I'm pleased with the Rosewill, and find it identical to the Filco or better(detachable cables!!) in all of the places that matter for function/quality. I will post some pics after work tomorrow.