Not as good as the original 1958 version, here's why...
This 1986 rendition has a lot of devotees (presumably because of director/writer David Cronenberg), but I found it less effective compared to the 1958 version with Vincent Price. Despite the gory state-of-the-art effects (for the mid-80s, that is), it's just not as compelling or horrifying (especially that final scene in the original). The one-dimensional locations are also a turn-off: Excluding the great bar scene, the whole movie takes place in a grungy lab or, occasionally, a swank office building.
Interestingly, the cast trilogy is exceptionally tall. While Goldblum (6'4½") is serviceable and gives it his all, he's not leading man material, although he's fine in secondary roles. And I was never big on Davis, but she's a'right I guess. At least the two absolutely look & act like they were meant for each other.
In its favor, the movie is a metaphor for how aging & disease slowly destroys the body. But it's a flawed parallel: In real life a couple & their peers age together and so they're all simultaneously turning into "monsters" in comparison to their youthful selves.
Despite the sickening visuals, it's heartbreaking and tragic, which you might not expect in a sci-fi flick about a guy who morphs into a fly. It thankfully avoids the rut of camp and melodrama.