Have just bought a womanizer Next, upgrade from LH clit suction toy, and just not feeling it-literally! Can’t seem to find the right spot with either size head and it all seems a bit underwhelming. Based on how much people love it in reviews I’m going to assume it’s my technique and that I need to persevere. So has anyone found the same initially and gone on to love it, or has any tips?! 
Hmm, to be honest, it sounds like it might be faulty (certainly not impossible, I’ve had two faulty suction toys in the past that didn’t hold their vacuum but were replaced with fully working ones). If it’s set high and on the deepest setting there’s no way you’re not feeling it. The most key thing is to make sure you have a good vacuum seal around your clit. Maybe try it with a little lube if you’re struggling to keep the seal? I personally prefer without but it can help keep an air tight fit. I would also recommend using the autopilot on a high setting, the switching around of intensities is very effective for me.
My OH prefers the LH sucker. We found the womaniser we have (not a posh one) more difficult to aim and when it let go it sounded like an asthmatic guppy.
Lovehoney sells the Womanizer Duo 2. I bought one for my OH, and I also got a Womanizer Premium 2 for OH. Both work very well. Both have an auto adjust feature that you can use or not use. I am not very familiar with the auto adjust feature, but it does affect the way that the controls work. If yours has that, you might try disabling it and use the manual controls.
Has @Peitho has said there may be a fault with the toy and ot would be worth speaking to customer service. I have always found them very helpful. Hopefully some one with experience of the toy will give you some better idea’s as well.
Could be a fault. Womanizers are a good toy and you should be able to feel it. They will send you another one if there’s a fault.
You could still check on whether or not the “auto sense” feature is on. With “auto sense” on the manual controls might not have an effect, and the “auto sense” driven setting may be too low to feel.