Aneros vice 2 questions

I have a few questions about the vice 2 and aneros in general.

1) how does the aneros work, cause unlike most p massagers this one seems to just sit their and that’s really it and with the vice 2 it just adds vibrations.

2) how does this P-massager compare to the Nexus Revo stealth or the Loki from LELO.

3) what are some tips and tricks with to try with the vice 2 if I were to get it.

And that’s it really I appreciate all responses to this post and any additional info I should know just let me know 🙂

Also I’m considering the Loki, Revo stealth and the vice 2 as my first prostate massager so if any of you have used any of these please sure your experiences with them.