Yes, you heard me right. I said dishwasher because I wash my glasses in a dishwasher. Okay, the odd glass gets a hand washing. Since most of my glasses get used during dinner parties, and there are sometimes dozens of them, I am not washing them by hand.
What makes a glass dishwasher safe, to a certain extent, is your tolerance for breakage. There are many dishwasher safe glasses. In truth, most medium grade crystal is also relatively dishwasher safe, particularly when you don't wash the glasses with plates, knives and other potential flying objects. I've washed my Spiegelau in the dishwasher hundreds of times with hot water and little to no soap, and have only had a handful of casualties over the years.
As I mentioned before, the height of the glass plays an important role in whether it even fits in a dishwasher, so that is something to pay attention to as well. One way around the height issue is simply going stemless!