I fly EVA a ton to Saigon and I have to send my stubs in every other trip -- for some reason they just don't get it right. I have to say I really like the SFO - TPE - SGN route, it's very convenient for me. Also, EVA service isn't that bad in Evergreen Deluxe, in fact, I've flown C on the top deck and I like Evergreen Deluxe better than their C product.

So, word of wisdom - keep your stubs and then send them in if your miles don't post.