I recently got one, a E series 3.1”. I really like the ergos- fits my hand well for a subcompact gun.
In my limited shooting < 200 rds, it performed superbly. I was able to classify SS in BUG using the traditional IDPA classifier in my 2nd outing, equaling my rating with my SIG 365.
I’ve experienced zero malfunctions using both FMJ factory, hand loads and various hollow points.
My only complaint has to do with the 12 rd magazine spacers in those additional mags I bought- the spacers are loose and not conducive to rapid reloading IMO. The mag that came with the gun doesn’t have this looseness.
I’ve found the aftermarket support is limited, to include holsters. I ended up getting an OWB kydex holster from Upper Hand Holsters and an IWB from Black Arch- both do well with the gun.
I’ve not looked into getting an RDS, but the E series is cut for optics, a feature I appreciate for potential future needs.