I have no opinion whether you should or shouldn't get one (so maybe I shouldn't post at all!) -but I have one question, in general, not specifically for the OP. By having a doppler, how does it change anything? I mean, yes you get the reassurance of hearing a heartbeat, but God forbid you can't find one, having that doppler isn't going to change that at all so how does that make you pregnancy easier?
That's not intended to sound rude - hope it doesn't, I just was wondering, how does having one change something you really have no control over anyway?
For me personally I think I answered your question when I wrote:

"Not only did we have the peace of mind of hearing that little heart beating away, but I think it also helped us form that early bond with our babies. It also gave DH a way to feel like he was a bit more of a part of the pregnancies."

You're right, it's not going to change anything, but hearing that precious heart beating away when you are having a moment of doubt as to whether your baby is still alive is the most reassuring sound in the world. After about 12 weeks with both my pregnancies I was able to find the heartbeat within at least a minute or two, and most of the times it could be heard the second I placed the doppler on my belly.

The joy my husband and I could share in while listening to our baby's heartbeats was priceless though.