But they cost a fortune respectively, and its the simplest part in the world to make. I think Neil M could match the quality in his garage and knock them out for 30 squid.
Most of the fitting problems i have come across have been with the R32 diffuser, and i can fully understand why they would have problems with this part, as it is a complex shape and design to say the least, but the mask should be fit and play in my opinion with that design.
Also Robin i am a big fan of Osir i have some of there products and they are great, but the mask is not up to scratch.