I fear that any potential issues with ORD/IAH will just ruin the previous LX F experience. I think it's tough to enjoy any international flight followed by a domestic USA flight can be such a downer, esp for Ord-iah (since iah is intl airport)
And.. Wow the LX F lounge rule feels worse than the UC Dragons that have been a source of utter hatred and disdain in past UAL posts. Somehow the idea that a paid LX F international ticket isn't adequate to get into an F lounge feels insulting while non-MM people who use ual miles to fly LH F get to enjoy the F terminal.