Recommendations for couple's vibrators?

Collection of related topics on Couples vibrators:

The Liv or the Gigi. Both by Lelo
I've been hearing a lot lately about the Gigi. I haven't paid much attention because I absolutely love my Liv. I flipped back and saw that they are...

How many couples use vibrators?
I want to know how many couples use vibrators or other toys on each other during sex or playing?

Couple's play
What positions are good for using a vibe during couple play?

Vibrators for both men and women!?!?
I need to know of a good vibrator for both myself and my boyfriend to both get benefits from.. any suggestions??

Vibrators for a couple
which vibrator would you suggest for a couples use?