Since I generally like to contribute when the Series 81 is discussed, I'll put my $0.02 in.
I find the 84 to be a really accurate pistol that feels great in the hand, points wonderfully, has reasonable felt recoil, is very reliable, has a nice SA trigger, and looks really sharp.
However, some people dislike the sharp recoil impulse, aftermarket support is limited, the DA trigger is a bit stiff (although I can shoot it really well), and the slide is difficult to operate due to the combination of a stiff recoil spring and limited grasping surface. I've found that my particular pistol is sensitive to limp-wristing, although this isn't an issue when I shoot it. It sometimes jams on WWB FMJ ammo, but I've attributed this to the unique truncated-cone bullet shape, and it runs great on virtually anything else. Finally, I
hate the ugly matte black Bruniton finish on the new ones; I greatly prefer the gorgeous blued finish on the old ones. (This criticism applies to the recent-production 92/96 as well.
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In terms to carry, the pistol is certainly not large, but there's no way to gloss over the fact that it's virtually equal in weight and size to several new tactical plastic designs with almost equal capacity. My own tests reveal that its length and height are within a fraction of an inch of a S&W M&P9c, it only weighs about 1oz less loaded, and it's wider across the thumb safeties. I'd prefer to carry the more powerful and cheaper M&P9c.
In terms of value, at $750, I place it in the same category as new $900 S&W N frames: really nice, but just not worth the asking price, and I'll shop the used gun counter instead.