I was about to bump this thread as well, as I recently ordered and used my Moon Pads.
I thought they felt a bit bulky, but after putting on my super-tight thin material pants and twisting around in the mirror, I deduced that no bulk is visible. Lol. Any they are completely silent, unlike disposable pads.
And they felt amazing!
To wash, I did the soak in cold water for 12 or so hours. Then they are safe to throw in the washing machine, then line dry / hang dry. I actually hand-washed some (after the initial soak) as I only ordered 3 daytime and 2 nighttime pads, and I used 2 daytime pads the first day as my first day is always heavy. So then the first 2 were dry to use for the 3rd day, but I only needed 1 a day for the 2nd and 3rd days. And I didn't have enough dirty laundry to do a load of laundry, so hand-washing made more sense.
And get this! For the first time in almost 20 years of menstruation (well that makes me feel old!), I could go the entire night without getting up to change pads in the middle of the night. The nighttime pads are really big and so absorbent (not too bulky though, but then again, it's while you're sleeping anyway).
Totally worth it. I spent about $100 on 5 pads plus shipping fees, but women spend more than that a year on disposables and these will last much longer.