Although not a trial, you can pay for a monthly license (which is cheap, $29/mo). If you don't like it, cancel it within 30 days and they will give you your money back.
When I enquired with JBMC, they advised me to 'purchase' a monthy licence and pay by cheque. In the notes section, mention that I wanted a trial and I received a month's freebie.
I thoroughly recommend it, it took a few days to figure out DA's .. differences.. and now I think its great. (apart from the default security choices that is )