It would be convenient but it would make me a little nervous. Last summer, I made online reservations for Holiday Inn Family Suites for the Friday night before our Saturday Flight. I had a confirmation number and printout of the reservation (acts as a receipt),and when we went to check in, no reservation was in their computer and they were full. The head desk clerk said that sometimes the reservations don't download the way they are supposed to on the internet and they get lost who knows where.
Needless to say, with 6 of us, I was almost in a panic but they "found" me a room after awhile since I had the printout and number with me.
I like knowing for a fact that I my "home" is waiting for me. Speaking with a real live person makes me feel like it's a real reservation.