Mystic Water soaps were a challenge for me to get dialed-in with the water at my house. It took me quite a while to figure it out. For me, it takes one of my denser brushes - either dense synth or dense 2-band badger - and only damp to begin. This is a soap that requires a small amount of water to be introduced gradually. A boar brush, or 3-band badger just won't work for me with MW because I believe those knots introduce too much water too fast. That's speculation, but it's been my experience. Also, MW sticks work best for me, rather than the tub. But again, that's just at my house. When I've been in harder water around the country, it lathers perfectly fine.
In terms of performance, at my house, it's a Tier 1 soap, but I've certainly experienced it elsewhere at totally elite status. Post shave is stellar anywhere.
As far as scents, there are so many, and most I find to be very well done. The SOS of them are all over the place; some are so subtle that they barely rate a 1/5 on the SOS scale, while there are some that are solid 4/5, and I dare say that Coconut Sandalwood might even be 5/5. But most tend to be in the 2/5 to 3/5 range.
My favorite MW scents are probably: Jasmine, Coconut Sandalwood, Marrakesh, Vetiver Oakmoss, Jeff's Lavender, and Leather & Smoke.