Not sure about the warranty. It can be very annoying particularly if they are a Taiwanese brand. Make sure the warranty is international!! A lot of places honor it if it is being claimed internationally.
I agree, A-Data is fine. It's not necessarily something you'd want to put into a highend gaming machine but it isn't garbage either.A-Data is a well known, and reputable brand on Newegg. Their RAM gets great reviews, and it's known as a good mid-ranged type of RAM.