p.s. removed the part about reserve size from the announcement, you are right, before verifying it, it's just words. We will make wallet public so everyone would know what reserve is available.
Cryptomixer verified their reserves by showing (privately) signed messages from all addresses to several, independent, trusted members of the community (In that case, shorena, me and another party, IIRC).
That way, they were abled to verify the integrity without risking the anonymity of their service/users.
We have quite large team of developers, including quality assurance specialists, our algorithm was developed based on best practices and was tested with both automatic and manual tests and every release made is covered with tests as well.
My point here is that user testing doesn't look necessary, but the more testing the better, so it is maybe a good idea, thank you.
I think the comment wasn't much about testing being neccessary for your platform to function, but for the users to accept/use it.
If you allow users to test your mixing for free, to verify it works and to leave small feedbacks, that would add a certain credibility to your site.
Nobody will trust a new service/newbie account with big sums of btc just out of the blue.