I have never heard of this being a problem with these necks from a personal standpoint . My opinion is as long as it is properly cared for you will enjoy it for years...........:
They are from the harder maple spieces,and just as strong as any maple neck.
Warpage will happen more in birdseye as opposed to regular maple necks,but as I said if taken care of(case,proper hum idity levels etc etc) you should have no problems!!!
Lots of people want the "bug swirls" more pronounced when buying a neck ,but this will make for a weaker neck. Look for some figuring but not covered if you know what I mean .Make sure there is grain showing also.I have had no problems on my fender birdseye necks!: