This is an
un-official reply. I understand your feelings and I sympathise, however to my knowledge there is no trial version. However you can see that there are literally thousands of happy users out there. I, myself started out with the Naslite Free to test, then bought Naslite+ 1.4 then NASLITE2-USB and then NASLITE2-CDD (for another machine). I have been more than happy with the program. Any possible glitches are likely to be the user's h/w and if you are still nervous than post your exact h/w description, including any raid adapters, for comment.
At the end of the day, I don't think that the cost of Naslite is too high even if it was a right-off (which it won't be), considering what it would give you. It license cost is less than most IT worker's time charge for 1 hr
Good luck with your next step...