Also, James..... If you put something out there for people to listen to, you can't get indignant when they give you their opinion. There will be people that like it, and people that don't. If you don't like criticism, best not to go public!!
If the same criticism was of a competitor's product, I don't see you jumping in to say his opinion wasn't valid (for him!). If NickG wants to say he didn't think it worth the money, that's his right as a member of the forum. Threatening him with no choice as an alternative isn't very good public relations.
If someone came to see my show, and at the end, when asked if they enjoyed it they say 'Sorry, not really' you are not going to make any friends by going, 'Well, others like me, and at least it's better than not going out!'. You should just go 'Well, sorry - what can I do better next time?' and let it go at that. Arguing with your critics is a bit futile.......
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An arranger is just a tool. What matters is what you build with it..!