Sounds like you're lucky so far Simon B; I'm not too fussy about reeds, I usually find about 80% are fine, and I use Rico Jazz Select or Alexander Superials. Very occasionally I'll find one that seems unplayable, and sometimes I'll get one that doesn't sound too bad but is just really hard work, these can be scraped into shape if i can be bothered.
Incidentally, there was a thread earlier about cut vs uncut reeds (presumably the DC in Superial DC stands for Double Cut?); I bought some Superials at the weekend from Allegro, and it must have been the ends of two tins in the one tin, because one strip of three was uncut, the rest were cut. I have found a slight difference with the uncut, they sound to me just a little richer and fuller, but only a little. In fact, if pushed I would say I prefer the uncut, I wonder if the uncut/unfiled Rico Jazz Select would be similarly richer and fuller.