Pro. Despite my exceptionally strong security, I feel Heimdal still offers several benefits. It's one of the best DNS hijacking prevention tools. It speeds cache resolution on DNS resolver requests, it keeps my apps updated, and it's blacklist is sourced from a lot of darkweb forums so it finds stuff most other web filtration misses.are you using the free version of Heimdal or the pro version? I used it for a while but found I did not need it with my current config.