Nea and Lily are identical other than their exterior. Both are about 3 vrooms. Maybe 2.5.
Mia is about the same.
Liv and Gigi are identical other than shape. I'd say they're about 3 vrooms, too.
Ina and Mona are both newer generation and are what I'd call 4 vrooms.
Siri is about the same.
Elise and Iris are older gen but have dual motors, one top, one bottom. I'd say they're about 4 vrooms, though impressive because you feel vibrations at top and bottom of the toy. YOu don't, however, get double the vroom, just more vrooms all over.
I think the older LELO is all very nice, very luxurious but is not enough if you need super strong vibes. They're not as powerful as even the most simple wired bullet, in most cases. They do, however, work wonderfully if you are sensitive or like a long build up. They will not provide insta-orgasms