I bought the Curt combo pack off of Amazon about 2.5 months ago, but have been procrastinating the installation due to lack of comfort with all the parts removal that is required. But I was on vacation this week so I finally bit the bullet.
Installed on a 2016 Premier.
My review on Amazon:
The time estimates I see posted on different sources are very optimistic. If you're wanting to do the job right and carefully do each step to make sure you're covering all the bases, it will take about three hours of analysis, interpretation, and application just to install the hitch and return the vehicle to original configuration. But I'm an engineer so I might get a bit carried away with that. I installed the hitch on my Volt Premier yesterday and it went well. Used a Ryobi impact driver for several steps and that greatly improved the experience. You'll also need to elevate the car to get under it adequately. I used ramps and a mechanic's creeper to roll around underneath for bottom panel removal.
The hitch is built like a rock. Well actually tougher than a rock. Very very solid. One small problem lies with its design in how it affects the current design of the car. The bumper frame gets moved rearward about 3/16" because of the hitch getting sandwiched between it and the frame. That causes the exhaust/muffler hanger to move that same distance rearward as well, since it mounts to the back of the bottom right side of the bumper frame. The problem is that the little hooks that the hanger sits on do not move back. So the hanger plate needs to be "force fitted" downward into the hooks to get placed properly out of the way of the bottom nut on the bumper. Took me a little while since I didn't want to damage anything very much, but it finally fit. Pretty much everything else worked fine though. The cutout dimensions on the instructions were not exact in how they are laid out, but you can figure it out with a tape measure and a comparative relationship between the holes for mounting the bottom panel. Make sure to use a torque wrench to verify you get the nuts back on to their intended level.
Everything went back together well and it looks beautiful. Very solid feel as well. And fairly low-key.
I installed the wiring today. That went well but there are a few little misses here and there. The instructions talk about removing the negative battery cable before starting but reference it up front, under the hood. It is in the rear, under the cargo panels. They also should have mentioned that the battery shroud might need to be removed to get the scuff panel out of the back. I had a hell of a time getting the center retainer to come loose and the plastic frame around the battery had to be removed to get the clearance I needed. The adapter that plugs into the tail lights is a bit bulky since you are adding two additional connectors to the limited space. But they fit ok if you do a little massaging of the cables to keep them clear of the tail light assembly when you install it. The right side is a real PITA though, if you have a subwoofer. I had to loosen two of the bolts on the subwoofer enclosure (rear upper and lower front) to get the clearance necessary for my hand to get in there. All this just get a single green wire with plugs in there. OUCH. But it got in there and plugged in. Good luck with your battery connection. I picked up numerous sizes of nuts and planned on just adding the lug to the top of the battery terminal connection. But none of them would thread correctly. So finally just used an alligator clip test wire to connect the battery terminal to the tap that the existing nut was holding there, as to keep power sourced to the car (while off), just to avoid any code resets or strange problems that I didn't want to have to deal with later. Then removed the nut and put the supplied lug under it. That worked well.
The quality of everything (except the instructions if we're being nit picky here) is top notch, as far as I can tell so far anyway. I'd give it five stars but I'm still not convinced it's quite perfect yet.
Edit to add: This is just for towing a kayak (Hobie Outback) and trailer (Harbor Freight folder). Total weight of about 400 lbs. Here it is on the back of my 2015 Leaf S: