If you have dual pane windows they will eventually get moisture between the panes and will need to be repaired or replaced (speaking from experience here). Replacements are very expensive, but they can be repaired much cheaper (again speaking from experience here).
When I was having my windows repaired this past December I found out that frameless windows cost double the amount per window if they are frameless.
I'm tickled that I have frame windows. I had 8 windows that had moisture and had to be repaired, but since I was at the repair facility after a 550 mile drive, I had all 15 windows done. The repair has a 10 year warranty (pro rated of course), but that is much better than a 1 year warranty with a new window.