When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
If you're going to keep it for a long time, just be prepared that the air suspension system is more expensive to replace than the standard coil spring system. This is not a unique issue to the LS, its just a reality of the differences between the two systems. Was the same way on the LS430 and the LS400.
After six figures of mileage all suspensions are going to need attention if you want to avoid odd noises, a harsher ride, and incorrect steering behavior. That maintenance is just (substantially) more expensive with the air system. It's not so much a reliability problem with the air system as just greater expected maintenance expense.
If you're looking for reliability long term, you should avoid air suspensions on any car. Any car.
Mercedes, BMW, Audi, previous generations of the LS, Lincoln...on and on...they all fail...and they all are expensive to fix.
And as far as the overall "control arm issue", keep in mind ALL CARS have suspension failures, it's just that ours is so expensive to fix...unless you avoid the dealer. Once you do that it's very much inline with what other people pay for their suspension fixes. I run a rather large repair facility, right now we are replacing tons of F250 ball joints in preparation for the snow plowing season, you should see what these repair bills look like. Yikes. And you should see how many control arms get replaced on other vehicles...along with tie rods, sway bar bushings, ball joints, bearings, backing plates. I mean it's literally endless. You should see a Chysler product...holy crap...ball joints and bearing for miles. And a Kia or a Hyundai?? It's not so much the control arm, it's the subframe it attaches to...they have rot holes the size of softballs in them...cars are junk.
Air suspensions have more components than the non air suspensions. All air suspension vehicles I've owned have had parts to fail including my LS. It comes with the territory. None air suspensions will be less expensive to maintain.
From the experiences I have seen, as well as my own, the real issue is that the struts fail sooner than they really should. The failures are on the hydraulic side of the strut, not the air side. But when the hydraulic side fails, of course, you have to change the whole strut.
None of this would matter if the struts were priced reasonably, or if the aftermarket offered options. But they aren't, and they don't.
I have no reason to think a 2013 LS is any more reliable in this regard than any other years. I doubt Lexus did anything to improve in this area.....I guess you could look up the struts in the parts book and see if they share the same numbers.