Are there any negative reviews or "down sides" to the G-Ki by Je Joue g-spot sex toy?

I already bought the Njoy Pure Wand sex toy and it did NOT work for me,in fact I only felt a cramp-like pain in my pelvic/belly area.Still I have some hope that this other toy(G-Ki) will work because unlike the other,this one vibrates and it seems to be more customizable or more positions/angles I can choose from which I guess gives me a higher probability that this time I will have a second g-spot orgasm in my life!I'm just afraid of not only getting disappointed but also wasting all that money!Can somebody give me some advice please?