The only major "later" problem that seems to consistently come up is the aortic aneurysm. For people with a bicuspid aortic valve, this seems to be part of a greater connective tissue disorder.
http://cardiovascularbusiness.com/index.php?option=com_articles&article=29568
Despite a low incidence of dissection, patients with BAV incur significant morbidity. Additionally, aneurysm formation was 26 percent and valve replacement 53 percent for this population.
Another item I've read about, but have yet to see much anecdotal evidence of in here is that the likelyhood of a brain aneurysm could be as much as 10x more likely in an individual with a bicuspid aortic valve than in a "normal" person. Keep in mind that while 10x seems like a lot, it is an extremely rare occurance in the general population and therefore only a little less than extremely rare in our case.
http://www.sciencedaily.com/releases/2010/05/100503161227.htm
Six of the 61 people with BAV had brain aneurysms, or 9.8 percent, compared to three of the 291 people who did not have BAV, or 1.1 percent. Studies have shown that 0.5 to two percent of the general adult population has brain aneurysms.
I'm under the impression that we are still being learned about. It's a matter of fully understanding the impact of this genetic condition beyond just the obvious valve situation. I refer to it as "the next thing". Okay, we can fix the valve and get them to survive. Well, with all these valve patients surviving a lot longer than they once did, we're discovering that they have a tendency to develop an aortic aneurysm. Okay, now that we're screening for those and fixing them, we're discovering that the survivors are more likely to develop a brain aneurysm.
It sounds scary, but we are all very fortunate to live in this day and age we're as long as these things are being watched for, they are very treatable.
I know when I first got my mechanical valve at 17, I was set for life. There was no discussion of monitoring for an aortic aneurysm as research either wasn't being done at that time or wasn't conclusive enough to base treatment on. Well, at age 36 I was surprised to learn I would have my second open heart surgery due to an ascending aortic aneurysm. Am I set for life now? Don't know. I don't know how extensive the connective tissue disorder is. Should I get a MRI or CT scan every five years to screen for brain aneurysms? Some in the medical profession think so - but insurance companies don't agree yet. Will my connective tissue situation just move down the line and develop an abdominal aortic aneurysm? Don't know that either.
I continue to go in every year to visit my cardiologist and get an echo and whatever other testing they recommend. If something comes up, I hope it's caught. If it's caught, I'm very confident that it's treatable. While not convenient or pleasant - it's far better than 50 years ago and I would have been long dead were I born 100 years earlier.