"Martin seems to be the supplier who announces when he will deliver some feature and does deliver then;"
I agree. I don't see how this contradicts what I have said.
"I do remember quite a few other announcements stating dates of release but the dates were not met - sometimes by far."
Are you contradicting yourself or are you talking about someone other than Martin?
"Furthermore you can't deny that he is indeed very busy and does produce quite a bit for RISC OS and if you look at what he does in a bit more detail you can see that he thinks about what he does to make sure the end product is good."
Why would I deny it when it is true and I have already said that "Martin W. only has so much time"?
"Or are your worries are that he's just one person - just think of David Pilling (and there are others too)."
I don't have any worries. I'm just pointing out that Martin W. is a developer, not a dealer, and, as he has now pointed out, is already working on three major products and is not interested in selling other people's products.
What about David Pilling? As far as I know he's not developing for RISC OS anymore, but that's a completely different issue.