I needed a strapless bra - I wear my NuBra frequently but it doesn't have enough lift and in certain tops gives off that they-are-starting-to-sag vibe. I usually wear 32D or 34D in regular bras, depending on the brand. To find the perfect fit, I ordered from multiple brands (Vanity Fair-34D, Maidenform-34D, Dobreva 32D&34D) - the 34Ds all make me look like I have early days Tomb Raider boobs - meaning they do NOT collect and push up my boobs to form a deep cleavage in the middle - instead, they let the girls hang out to the sides and make my chest look wider than my rib cage. 32Ds generally work out better than the 34Ds but the Delimira is a clear winner because it does not give that straight-across-pressed-down-and-minimized-bar-boobs look. The cleavage is very flattering with or without the straps (see pics).
Kudos for the clear straps too! I am sure i'll use them at some point.
I have not worn the bra long enough to know if I need to adjust it frequently or whether it'll give me discomfort of some sort. So far it feels secure and comfortable for a strapless bra. I'll update if it starts to suck.