My birthday is coming up….and I’ve been hobbying 10 years or so now and have never done a double (been with a duo).  Me and two women to be specific. I would love to hear pros and cons for and against.  
Always in debt to your priceless advice,
FoD

Pick a duo that has chemistry & genuinely loves each other it makes the encounter better.

QueenBia had the perfect advice.  And, to add to it a bit, maybe pick your favorite provider you've been with so far and ask if she has a friend.

Matchmaking ladies is a very Level 2 kind of endeavor...you probably want to see if you like all those legs and arms around you at once!

I think the best way to ruin a birthday is having a lame and expensive duo session so be safe and give yourself the best chance to party like a rockstar! =)

Climate change. Stagflation.  The next plague.

Doing a duo is not one of them!  Go for it!

Of course, as QB says, do some diligence and find a pair who look attractive to you and who know what they're doing around the female as well as male body.  

To make it easier, I've done quite a bit of research for you; check my numerous duo reviews.  You're welcome.