I had one
I had the same model although I just traded it in. First, I have a friend involved in a case where a paratrooper at Fort Bragg was shot with a .380. The bullet shattered his femur and came out the other side. If a round can shatter the largest weight bearing bone in the body of a muscular North American male, that should be good enough, right? I think a lot of these discussions about knock-down power are misplaced. If you shoot someone with a .380, they are very likely to die or be seriously wounded. Whether they would be more dead if shot by something else is moot, so you're only going to be aiming it at someone when you fear for your life with no option of escape, so that you might have to take theirs. Many popular gun writers agree it's the minimum caliber adequate for personal defense.
This model is fairly large and heavy for a .380. But as a result it also has very large magazine capacity, longish barrel, and less recoil than most .380's, which are vurtually all blow-back designs. The trigger pull in both DA and SA is very good. The sights are decent. The ambidextrous slide safety can be applied whether the hammer is up or down, not true of many DA pistols. It has a firing pin block and a chamber loaded indicator, all nice safety features.
The trend nowadays is for compact polymer 9mm's, or taking .32 "pocket guns" into .380 to make a highly concealable package. So in that sense the 84 is obselete - it's almost as large and heavy as some popular compact 9mm's. But while the double-stack magazine makes it wider than the 85, it's still pretty compact. So is it the first choice for CCW use these days? Probably not. But it has the features above going for it and the general advantags of semi-autos over revolvers. Good luck.