There is a demo on the site, but it has A LOT of extra crap and looked kinda overwhelming but don't let that put you off. btw, I don't work for either company, but I've monitored traffic about 60 ...
The Free Edition linked above gives you 30-days of unlimited interfaces, but after that it converts to only allowing 2 interfaces (but all the features), which is all you need if the ASA is your only ...
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