I was a little annoyed that the stock '17 hatch brake performance feels like there is fade after only a few minutes of spirited driving.
These have more initial bite and total stopping power, but i haven't done any spirited driving since i swapped them. Time will tell.
Anyway, important notes:
This was successful on the "17 facelift Sonic 1.8 with 16" Preem wheels. Should be the same for '18, '19, '20
Clearance is "OMG i can't believe they fit" on the 16" wheels.
Does not come with replacement rotor locking screw to keep the rotor flush, like the stock ones.
They will flush like older\different vehicles do when you remount and torque the lug nuts.
Absolutely $%^# the crush washers when replacing them. Some aren't a pain, but these were.
Make sure you use a lug nut opposite the caliper to keep it as flush as possible when mounting the caliper, so it won't bind the rotors.
Do this also when bleeding afterwards.
It's mostly straight forward, but it would have been nice if they included 4 crush washers instead of 2. I needed to buy two more.
For the price it would have been a nice to have, but not super necessary, to have 4 new caliper mount bolts (they're not supposed to be re-usable, but everyone does and it's usually fine), a replacement mounting mechanism for the brake line retainer, as the old one doesn't reach the mount (use zip ties).
The instructions are a little lackluster. They might as well be just saying to take off the old stuff and put on the new stuff. Which is mostly fine, if your fairly mechanically inclined, but even still i asked a few clarifying, expectation questions before tidying up and feeling comfortable bedding the brakes the next day.
I chose to do this instead of the Encore\Trax\Camaro parts swap because i didn't want to do the sourcing, modifying and piecing together parts, so mainly out of preference for convenience.
Thank you ZZP and i look forward to putting more of your parts and tunes on my 2 Sonics.