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I own several dishes, one of them is Mola Euro. I also tried Demi. While Euro and Setti have their place due to size and shape, Demi was nothing special.
Speedotron has similar dish and it costs less than 50% of what Demi goes for. You can also get a grid for Speedotron for under $150. In fact I have that combo and it's awesome - I recommend it over the Mola.
At the moment my favorite dish is the Profoto Silver. The silver coating is the reason I like it so much. I could get any other brand and probably be just as happy, but at the time Profoto was the only one available in the size with silver coating that fit my lights.
I'll throw another thing at you. Since you own a BD, and maybe want to add another one consider Elinchrom Deep Octa instead.
It isn't the same as the BD, but similar results can be obtained. If you shoot on location Deep Octa is so much easier to carry around (I hated dragging Mola Euro with me). Euro is collecting dust, I used it only handful of times since getting the Eli DO.
Deep Octa 39" is one of my favorite modifiers for location work. You could also try their 27" version, which I have no experience with so I won't recommend it.
I'd really like to try Setti in silver. I'd most likely love it, but it's too bulky to take outside of a studio.
If you are looking to get Mola Demi because you think it will blow you away in terms of image quality you'll be disappointed. It's good, but so are the other dishes.