Something that I did not appreciate when I viewed them on the Tantus website, but is much more visible on the EF pages is that these all have a smooth/glossy head and appear to have a more matte finish to the body. Looks interesting. I'm new to toys, but I don't think I've seen that before.
I've always been attracted to the Vip shape, I definitely want to try it out in Supersoft.
Is O2 a lot like Vixskin? I don't remember seeing a comparison video for them.
I know that Carrie Ann did a video comparing the Raquel (Vixskin) to the Niagra (O2). That'd be worth checking out for a good comparison. Though it does seem like Tantus upped their O2 line to compete even more.