Coming up on 50k miles on my 2019 30i and it’s been great. No weird issues or unexpected maintenance outside of regular schedule stuff. It does burn through tires and brakes, but that’s likely more my wife’s fault than the car. Maintenance is definitely going to be more expensive as you’ll want to do the xdrive service, coolant, brake fluid, transmission, etc. The Altima is FWD, so that’ll be new and that xdrive service runs about $700 at a dealer. It gets great gas mileage and if you want to add a little more power, you can grab a JB+ which is 2 clips into one wire and adds about 20-30hp/tq. Obviously lots of other options if you want to get nuts with tuning and bolt on parts.