I have an onyx 2 and it’s pretty amazing what it can do when the content is good.
It simulates stroking ok, but where it really shines is “the rest”. For instance during a good deppthroat scene with a good script you get the feeling of constriction that just holds for a bit before relaxing.
I wouldn’t consider it hands off. Seems to work better if you adjust the “terminal depth” according to the action a bit, depending on the content. Which so far ranges from incredible to worse than without.
To cover the noise, a set of noise blocking headphones is essential. The kind that hours in the eat and acts as an ear plug at the same time.