Hiya, well, where do I start, I'll just tell you about the issues you get with the ls430, then you can make up your own mind.
Gearbox failure, air suspension failure, vsv valve, speakers failure, cd player failure, rust on both front doors, rear air con stops working, its the kinda car that when you come out the house every morning, and before you even open the drivers door, you think to yourself, I wonder if every thing is working? There may be more faults, but I cant think now, it's too early.
Lexus actually called me this week about an event they have on and that they will put £4000 towards a newer Lexus, my answer was this, " yes lexus is more reliable than bmtroubleyou, Mercedes etc, but the most reliable Lexus for me is the ls400, the newer Lexus's use so much tech, that things do go wrong and it gets expensive, I've also had gs430 mk2 sport, gs300, sc430, is300, ls430 and I have to say, none of them are as reliable as an ls400" he agreed.