I've tried three (compressor, spectrum enhancer, distortion), I think they were from the 100 series and all were awful - main complaint was the ridiculous noise floor (so much hiss, it'd put a Metal Zone to shame).
They was R100/ea new and I got my $ back when I returned them
But this 300 series, some of them don't seem to have that issue (though the drives - fuzz excepted - didn't sound much like the originals) - the drives all seemed a bit muffled. The only one I could find a price on locally was the Tuner, at R600 new, I'd still go for a decent 2nd hand Boss/Korg/TC.
But at R200-R300 2nd hand, I'd give the delay, vibrato, tube overdrive and fuzz a whirl - they sound pretty usable from the vid.