Plastic pedal eh? Try knocking your head against it...
There's no accounting for taste obviously, but I'm very happy with the tones it produces. It's a bit fickle to use live, but has given me some excellent results on (non-Queen) studio recordings.
All you need is the Digitech pedal and a Vox Pathfinder amp to do it nicely. If you want the real thing you have to get an AC 30 whether you use Fryer Treble Booster or the Digitech with it. These offbrand attempts tend to make a similar noise that is familiar at best, but never within that specific exactness of Red Special magic.
The technology is pretty much here with that Digitech pedal, but give it another 5 to 10 years and every amp will have some sort of digital Queen setting with perfect results. They already have gone from 6 years ago's insult that they'd claim it's acceptable as a ghetto version comparison of Brian May. My friends new Line 6 sounds like my Burns Red Special is all he lacks from a good tone worthy of praise.
The Fryer pedals are authentic obviously since they are the real deal, but they overload the Pathfinder amps to noisy distortion so the only option is to make your neighbors 4 houses down angry by the loudness it takes. The Digitech dos well with the low volume Pathfinder set up and it also controls the AC 30 to loud enough levels to keep your ear's healthy and pleased by the sound's epic shape holding on without the deaf threat.