We've got a Womanizer Premium, a Womanizer Classic, a Lelo Sona Cruise, and a Satisfyer Pro3.
The brands do feel a little different, and Mrs Chimp uses a slightly different technique for each. The Womanizers like a good seal, and don't like being knocked off their spot. Sensation-wise Mrs Chimp says that these feel like a 'gentle tugging'. The Lelo Sona Cruise, in comparison, feels more like a 'gentle tapping', and Mrs Chimp likes to hover that one over the area rather than lock it in place. The Satisfyer has a separate vibration setting as well as the air-pulse so that feels like there's a whole lot more going on.
It is her least favourite of the lot though.
I know some people who really don't get on with one but absolutely love another (and some can't abide the feeling of any at all), so some of it will come down to anatomy and preferences.
They were a revelation to Mrs Chimp though, so well worth a try if you can find one for a good price.