Bought the QW 757 on sale. I knew what I was getting into regarding the simplified systems, but was disppointed regardless.
The copy protection requires installation of the FSDreamteam add-on manager which will linger in your add-ons menu despite you never having to interact with it after activation and you can't move the aircraft folders out of SimObjects\Aircraft without the gauges ceasing to work. You can look past that if you don't mind the additional clutter.
The lack of tooltips and weird mouse interactions on selectors also gets a handwave. It's originally a FS9 model after all.
My personal red line is the cockpit geometry. Misplaced and missized cockpit windows just ruin the experience for me (compared them with the exterior model when making modifications).
On the upside, the model is easy on frames, you get all fuselage variations and the flight dynamics are believable.
Captain Sim's offering sadly is harder on frames and would require FDE work and other bugfixing. And you'll pay your butt of to get all the model variations.
This leaves the Freemium 757. Not sure if it contains any model-based copy protection, but a merge with a FSX native converted POSKY 757 is theoretically possible to get around the (mandated) lack of liveries. And any model simplifications and inaccuracies are negated by the price tag. Haven't tried it though.