OK, we'll start with the good. Pretty good about free speech. Me and my group of close pals can be pretty rough and none of us has ever been reprimanded. In my wider circle some have be banned, but again what we say on a daily basis would never fly on Facebook or Twitter.
If you're touchy about certain subjects or do not like your beliefs questioned, or love being in the echo chamber, you have the option to mute or block people, so they can never comment on your stuff and you will never see anything they write (a feature I think they put in to attract Alex Jones and ppl like that to the platform, since they do not like to be challenged.
Unfortunately, the platform itself has lots of trouble. Most days it takes several tries to connect, sometimes losing connection several times a day. Sometimes it'll be offline for whole days.
The way the conversations unfold are very confusing. Twitter is far superior on that score.
Also, in terms of the privacy issue: There was a shooting that involved a guy who was a Gab user (who also used Twitter and others), and Gab was happy to hand over everything to investigators without warrants or anything, many people who were in no way involved with the crime ended up being visited by the FBI.
So user beware.