Cat_nap2, Firstly, welcome to CF.
With regards to your question, yes, these types of main definitely ad a lot performance wise. Not just due to their extra area, but in particular, due to their greatly boosted lift
to drag ratio.
Because of their shape, it's like getting a lot of sail area for "free". And if you do some digging, you'll find the "math" which explains this. And there's data out there which will tell you how much. I just can't recall
where to find it at the moment.
And not to derail your thread, but this is a topic which likely has gotten & would get a lot of input over on Sailing Anarchy (forums).
Especially given the high percentage of Performance, & Multihull
junkies & experts over there. Basically I'm just saying that it's a good resource is all.
Also, I'd wager an Extra Large sum, that there's a lot of info on these sails
in places where skippers & crews of F-boats (Farrier trimarans) congregate. As, much of the time, these boats & fleets, are at/on the cutting edge of new (sailing) tech developments.
For instance, they were doing synthetic rigging
a couple of decades ago. Including the various shrink on coverings for the shrouds & all.
If you do pursue (and find) links to good info on the performance gains on this type of sail, I for one, would surely appreciate it if you'd come back here & post them.
That, plus if do you go with this type of sail, I'd be interested in reading your thoughts on it.
Though, bottom line, there's little question that they work. As pretty much everything which floats, in the higher end racing
fleets has them. From windsurfers, all the way up to Maxi
multi's & monohulls.
As the saying goes: "How fast do you want to go? ...How much $ do you want to spend"?