I have the Jopen Vr6.5, the Vr5.5 looks very similar so I would suggest it. I have the G4 tiger but haven't been able to stimulate my G with it yet because I need dual stimulation.
One thing to keep in mind and I don't know if this holds true for the Vr5.5 but on the Vr6.5 the clit arm is not a strong one but quite pliable so it won't hug snug to you. I like it because it reaches my body frame just perfectly and if I wrap my clitoral hood over it it hits me just right.
Once the clit arm is in place my G gets real pumped up and the internal shaft provides the best G stimulation for me than anything else I've tried.