There are lots of reviews on the mimi and other similar products. I'd check all of them out.
It's seems like a pretty straight forward waterproof clit vibe, and I'm pretty sure it's one of the less expensive "luxury" ones. The nicest non-waterproof version out there is probably the Siri by Lelo. JJ makes three waterproof vibes that you could compare it to as well, the form 2, form 3 and form 4. The form 4 can also be inserted as well as used on the clit. Pretty sure all of the JJ's are more expensive though.
As for the Mimi, i haven't tried it for myself. I've heard mixed reviews on exactly how strong the vibration is. Naturally different people consider different things "super strong." If your ideal is level "high" on the hitachi, then your opinion of what's "way too weak" will be very different than someone who thinks the Gigi is as much oomph as you'd ever want or need.
I'd look for reviews that talk about that specifically, and see if you can't find people who are familiar with the toys you have used and like to see if the Mimi offers what you're looking for.