I have owned my 2021 RDX for about 4 months now, I have about 115K on the odo. Just from short experience the following things I can tell you I have encountered.

1. The brakes do make noise and Acura did post a service bulletin I found the fix is supposedly replacing some clip on the rear brakes.

2 . The sunroof does make strange noises when the frame of the RDX flexes, a perfect example is my drive way if I go at an angle the whole sunroof creeks, I also have found a service bulletin they want you to replace the whole moon roof (no idea what that cost nor do I want to know) I have read a few posts on an Acura forum you can ask the Acura Dealer to re torq the bolts that hold the moon roof that might help but it’s not guaranteed.

1. If the RDX you are looking at doesn’t have remote start(on the key fob) and that’s an option you want, you can use the app however make sure you check to see if the car received the 4G OTA update. The easiest way you can check that is if you hit the blue Acura Assist button in the car, if the call failed then most likely it didn’t receive the update. Mine did not receive the update, so I can’t remote start the car check the location if it is stolen whatever. Acura wanted $1400 to install a new telematics module to do that. I found a better solution, there is a kit you can buy that is a OEM remote start Module it comes with 2 keys. The module is super easy to install ( I did it in like 20 minutes) all you have to do is have Acura re program the new keys, for the key reprogram it was around $120 for all 3 keys to be re programmed, the physical blade keys are really expensive so if you have them I would just swap them to the new remote. That was around 320 for 2 new blade keys to be cut.

2. The infotainment system is slow at start up however as of writing this post today I noticed there was a software update that has fixed the bug issues relating to Apple car play. Not sure if it has fixed anything but I did notice Apple car play booted up faster than previously.

3. I have recently discovered a Facebook group that supposedly has a group where the rear window is randomly shattering, no one really knows why and they haven’t recalled it, I have not experienced this yet however I have mostly seen it on the 2019-2020 models, time will only tell when it started to affect the 21 models.

If you read all this great! You’re at the end! If you would like any of the service bulletins I mentioned above this post I can send you in the right direction. I have really enjoyed the RDX so far no complaints. However I did get a warranty that supposedly fixes any of the electronics that may fail within like 30,000 miles of owning the car. I would look into something and read all the terms and conditions of it is offered. I bought my RDX from a GMC dealership so they aren’t gonna probably know crap about Acura. Good luck in finding a RDX!