Well, I have owned 3 Lexuses, all three of them '92s, (ES300, LS400, and SC300) and I can definitely say that the quality on these vehicles is outstanding. It's amazing how you can get into a 15 or 20 year old vehicle with 200k+ miles and everything still works as it did when it rolled off the assembly line in Japan. As many others in this forum have expressed, What makes Lexus so popular is its quality and reliability, which are both superior to German cars.
My uncle owned several German cars and had many problems with them, now he says that he will never buy a German car again, and he is in love with Lexuses. Many people are starting to make the change from mercedes and BMW to lexus. In about 20 to 30 years, I guarantee that you will see early 90s Lexuses still on the road with 500k+ miles.
Now, back to the original topic, Im not a big fan of the RX because im not a fan of SUVs, but I've driven my uncle's and it is very nice riding and very comfortable. It has almost 200k miles and still feels silky smooth.