As a CIS man, I can say that YES the nJoy Pure Wand really is as good as others say... at least it is for me when I'm using it to stimulate my prostate.
My Wife does not particularly like it for her but that's her personal preference.

I(F) have an NJOY Pure Wand! While I know how to squirt and can usually tell when it's gonna happen, this thing makes me squirt without me even knowing that it's coming. A lil' weird, I guess, but maybe that's a good thing for women who haven't been able to squirt.

It's a heavy toy. It also gets really slippery really fast, even with just water, so be careful when handling it. I think it's because of these two things that I get blessed with squirting so much lol. Def recommend it!

Any techniques to using it ? I read there is a serious leaning curve

I haven't pressed her for exactly why.
A response of "I just don't like it." is what I got when she tried it when we first got it a while ago.
Thinking about that now, it occurs to me that none of our other hard surface (metal or glass) toys are in Wifey's Go-To category.
I'd guess that she has a dislike of hard unyielding material toys so that would most likely be the reason she doesn't like it.