When I was a consultant for silicon companies designing audio chips, we used to have many listening sessions. Generally, it would be listening to small features, or small improvements that I had made - but the whole team would be involved. One engineer, struggled to hear any difference at all, and was self confessed deaf. Another engineer could hear differences, but had difficulty articulating them. The third engineer was excellent - he was as sensitive as myself, and very good at describing differences. Like me he only needed a very short time to accurately evaluate sound quality.
One of the three was a musician too. Can you guess which one was the musician?
Yup, it was the self proclaimed deaf guy!
Add into the mix that some people prefer different types of sound, with vastly different sensitivities, then follow the rule - listen carefully for yourself before you buy.
That said, the tens of thousands of Mojo owners, plus the reviews, plus the enthusiastic posters here talking about Mojo's musicality, can't all be wrong.
Rob