I see that the local K-Orgs/C-Orgs are advertising this ... I'm wondering if I should avail myself of the unique circumstances of the present day in South SF Bay, if you know what I mean.
 
Yes, I understand that it's a very subjective and personal taste thing to ask about.
But, there's lots of things, like Blue Cheese, Anchovies, Kimchi .. that you'd never try if left to your own devices.  

Value is in the mind of the monger. My suggestion (as one who's done a variety of doubles) is to go for it. Every time I've spent more than I thought I should in this game I've walked away thinking, "That was worth every dime!"
Remember the wise man who said, "I spent most of my money on booze and fast women. The rest I wasted."

The only thing I would say is have a solo session with the other woman just to see how you guys get along..

who are genuinely bi-sexual is much smaller than for other ethnicities, so those that offer doubles are most often "gay for pay', so you should not expect too much girl on girl action unless you are certain the girls you picked for this are into each other sexually.  In  other words, if you got sick and didn't show, would they still get together because they were ginned up for a little bisexual action and looking forward as much as you were to eating some pussy?

It'll make it easy when your flipping and swapping.And seeing that G on G doesn't float your boat, then you're easy...have a good time

MFF implies F in the middle having fun with M and F simultaneously. M might be doing K9 while F in the middle eats out F2. Or maybe M getting BJ from F in the middle while F2 fucks F in the middle with a strap on. It also allows for M.....FF which is M watching F on F action.
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FMF implies simultaneous 2F-on-1M action. Oftentimes, FMF turns out to be F.......MF and FM.........F : more of a tag team event.  FM go at it while F2 steps outside the ropes for a bit. Then, a switcheroo.  No or very little FF action.
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My experience with FMF was that it was tag team only. Fun for a bit but not worth paying double for the 0.5F + 0.5F = 1F net.  
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Are you interested in the F-F action? See if you can tactfully find out if they do that. Otherwise, expect FM..........F.  
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Good luck! Have fun!

I’ve done a few and it has never been worth it for me.  

My first experience was with two lower tier providers and it was sensory overload.

Yeah, fmf turned out to be underwhelming and twice the price. And I felt guilty about ignoring one while involved with the other.

... for me, at least. I did a count not long ago -- about thirty encounters with multiple partners -- many MFF threesomes, one MFFF foursome, one MFF tag team and about half a dozen orgy-like situations. When it came to the threesomes, many times I was in the position of introducing one of the women to the other.

depends on a couple key factors ...    even if not into G on G .. and neither am I ..  the two girls have to be very comfortable with each other and know each other.    when it was just two providers random or two girls who work together but just available for each other ..  it wont be that much fun ..    

Like others, I've done a few and they were alright. The first few are always cool because it's a new experience. But the thrill of the experience goes away after a while. And finding providers who are truly bi and not "gay for pay" can be difficult. The one that I need to check off on my bucket list is MFM.

Tap into your Brain ie  the Ultimate/Universe. How do you believe WE can do this. We meaning Us. Doing this over and over Each. Experience. Is. New Experience. Different. ie Special.

If that is how big she will "admit" to, just imagine how big she is IRL? Not to mention the reviews say 41-45 in age. In my experience any Asian provider with reviews that admit to her being over 40 mean that the girl who you actually meet is going to be WELL over FIFTY.

it is all about how you direct the ladies.  

Been there done that, 3  or 4 times.   Glad I did it, but don't plan to do it again.
It does make you wish you had 2 dicks (or maybe 2 tongues) though

Done 4 or 5 FFM's. One MFM.. honestly.. my favorite..  

I've been fantasizing about doing a doubles session for a long time now, but then I've read on this site on many occasions that it wasn't really worth it

I think MFM works better if both guys are BI.  less reluctance (even tho mostly hidden) to male to male contact while pleasuring the gal. Especially so in double penetration attempts.

The MFM I did involved zero contact with The other guy.. no DP..lots of spit roast. I also did a MFMF once. The girls were into each other... the guys were into the girls.. so no contact between the guys at all..

lol, well it the gal is down for double penetrations' (i.e., cunt and ass)  there is no way that I know of to accomplish that without some male to male contact. If it is just pussy and mouth involved, then yes, very possible without any male to male contact at all.

Correction on my previous post.   I meant FMF (not MFM).  Crossing swords would ruin the whole MFM experience
maybe Ok for some, but I don't like surprises.