Sound Stage was the first EM pin in my dad's and my collection, so there's a slight amount of bias toward the title for me. We're also slightly biased because it turned out to be way more fun than we expected for the paltry $300 we paid for it.
The layout is solid--nothing really too unique about it but its geometry also doesn't create a lot of "unfair" drains. This is one of those pins that, once you learn the rules, you kind of set yourself up for certain shots and to try and get your "sequence" complete as quick as possible, and some of those shots are very risk-reward centric. It's not a super easy machine in that regard, and it's very possible to have a total garbage game immediately after rolling over the score several times on the previous game. Geometry is such that, contrary to a lot of other pins of the era, the ball safely returns into the inlanes just as often as it threatens to drain down the sides.
Its main gimmick is the spinning disc in the center of the playfield, activated by hitting the two standups in front of it. It works nicely and is very satisfying to rip a bunch of times in succession--but it's very easy to hit it on the fly and drain straight down the middle, leading to a good bit of frustration. The C and D standup targets, one on each side of the playfield, light the spinner after both are hit, increasing the disc from 100 points to 1000 points. Basically, you can ignore the vast majority of the rest of the table and keep ripping the disc once it's lit. For this reason the game suffers a bit from feeling a little same-y after a while, and makes me wish for other substantial scoring options.
The chimes are really pleasant, and not at all earsplitting like many of the era tend to be--I'd say this is one of the more pleasant EMs I've played as far as sounds go. Ripping the spinner gets you a ding every time it registers 100 or 1000 points, so it can be pretty exciting to get a good hit on it and have the chimes go nuts while you try to regain control.
Aesthetics overall are nice and vibrant and don't wear on me like some of the weird psychedelic-esque palettes of the time (I'm talking to you, Target Alpha and Galahad).
Overall I'm impressed, and would take a Sound Stage (or Juke Box, the 4-player version) over a lot of other games of the era that fell back on boring symmetrical layouts without a lot of thought put into the lastability of the title. I like it well enough that, even though my dad has one at his place just an hour or so away from me, I'd probably jump on buying one for my own lineup too.