We're all for increasing the lady's pleasure. After all, we fall into the "lady" category (though some might debate that). But we have a few issues with the collagen injection meant to blow up the G-spot, making it "easier to find."
Since we're typing one handed, and not in the good way, we'll keep our litany of complaints short:
Syringe in vagina: ouch!
Huge price tag: ouch!
Effects wearing off after 4 months: what a disappointment.
Possible awkward moments between you and Mr. Tampon.
How about you train yourself and your partner to find your G spot, which is most likely perectly fine the way it is? Invest in a good dildo and some instructional videos, if needed. If your partner still can't find it, it's not the G-spot that's the problem...
[Marie Claire: New injection enlarges G-spot]