My experience is limited to the E-Series but here are the bits I didn't care for. Please note that I always look first at platform, reliability then accuracy and ergonomics when choosing a pistol which is why I chose the S&W. I prefer to change bathwater rather than throwing out the baby.
First notable thing on removing the slide is the sizable chunk machined out around the hammer. Likely Smith did not reprogram for the 70 style or are planning to add a Swartz series in the future.
The other notable is an interrupted frame rail on the port side. I don't recall any other 1911 frame that has this.
The trigger, while being fitted much better for vertical play had an excessive amount of creep. Pull weight was also a bit heavy which is customary with S&W autos.
Grip safety while nicely fitted to the frame was a bit sticky when releasing from the stirrup.
What I did: obviously I was not about to attempt major frame surgery with a TIG welder but I did choose to replace the trigger, recut the sear and hammer engagements, and of course with the trigger changed filed down the GS to fit. I did note a small burr on its underside where it was catching (forcing a full depression to deactivate).
The slide to frame fit is what I would call slightly loose as opposed to "combat loose" meaning I think it will run dirty for days but not weeks.
The good news is it ran from the box, it was better than combat accurate, the serrations are filing down my calluses nicely and it looks nice enough for a SS pistol. Extraction is also positive and without damaging brass.
I would buy one again in a heartbeat but those thinking S&W is now building a competitor to say Les Baer need to look elsewhere. Those looking for a solid, good shooting 1911 can add the E-Series (along with the older SW1911s) to the list.