I've done a couple of these. Not so good as owe's with respect to flexibility. Cost of add-ons can be quite steep if you want to visit cities in the US or Canada not defined as pacific (e.g. ORD, DFW, etc.). This can be got around by purchasing an AA visit USA type ticket (priced base on segments - min. 3), the rules are restrictive but can be upgraded using VIP's or electronic upgs if you are AA elite. Watch out for the surcharge if you want to go to South America - ex Australia it is quite expensive.