There are varying degrees of amish-ness. Just like there are small differences between christian church denominations.
There is a time in a young amish person's life called Rumspringa when they are permitted to "explore the usually forbidden modern world before deciding whether they will forever commit themselves to the Amish way of life" (abcNews). I've watched documentaries on this, and most decide to go back to their amish roots. It would be a hard choice. Lots of temptations...