The Between Cultures Bandwagon

Two of my favorite WASP authors have just released novels exploring a between-cultures motif: John Updike (Terrorist, current Amazon sales rank: #17) and Anne Tyler (Digging To America, current Amazon sales rank: #39). Frequent vistors to the fire escape know that I advocate a liberal position on who can write what for and about whom. Others, however, have been critical of the so-called cultural "risk" these writers might be taking. Has anyone read either of these books? I'd love to hear your take as I'm too busy trying to meet a deadline to read much (which means I'm miserable, uptight, and going through other painful symptoms of addiction withdrawal.)