I say try it out. I used to be a shoulder only gal, but after many years of it and 10,000 headaches later with shoulder and neck troubles caused by it, I finally made the switch over to arm carry. It was SO HARD and took about a month but now I wouldn't go back!
Agree with the rest that it depends on how much you like (or can accept) handheld bags. For bigger bags I find it a pain to carry them handheld...shoulder style would be more practical. Ultimately you wanna make sure you'll use it, not just admire it from afar