DNL has a great return policy... they gave me my money back. My only stress was because I really wanted to get both rings photo'd at the same time for a good comparison, and I only had about two weeks for BTD to deliver my ring in order to do this.
They came through with flying colors!
The BTD Tiffany Repro is on her ring finger.
Anyways, that's the important thing to remember... You might not like your ring from DiamondNexusLabs, but they'll take it back (within 30 days of delivery) and give you a full refund as long as you don't maliciously damage it (although you pay for shipping back to them).
Thanks again to all of you for your wonderful replies