No and No, why you ask?
The longest i ever kept a set of aftermarket wheels is 1.5 years. Might upgrade to 19s soon.
just asking cos of the fitment dramas we had when doin your drop. they shouldn't be that tight on the studs is all. when your ready to upgrade try not usin tempe for your lexus. 19's will look awesome with your drop although a bit harder on the bumps.
up to you. depends how hard a ride you dont mind. 18's make a diff 19's im sure will be pretty solid. 20's probably hard as. danny probably would confrim lol. id hate the ride quality he got now. no more luxury. but looks good.