I ordered some of the Yamaha synthetic reeds a few days ago on a whim; since I've been experimenting with Legere (mainly good) and Venn (very good) I thought I would try Yamaha's offering too.
Sadly I am very disappointed and consider that I have wasted my money. So be warned: they maybe cheap(er), but in my opinion the are useless.
Firstly, the Yamaha reeds are like planks: even on the closest facing alto piece I have (Vandoren AL3) the softest 2.5 felt very hard.
Secondly, the sound is exorable, probably worse than any synthetic I have played (and that's saying something).
The construction is weird. The part of the reed that would on a cane reed be under the bark is slightly raised, giving a small step into the part beneath the vamp (as you can see from the pictures in other posts here). This means that the reed cannot possible sit flat on the table of the mouthpiece at the point where it blends into the facing.
I cannot understand Yamaha's logic with these reeds and I can only surmise that this is a desperate attempt to get in on the synthetic 'act' along with Legere and Venn. It's very disappointing because I am a fan of Yamaha's instruments.
Call me 'Bewildered of East Finchley'