Bitcointalk username: dkbit98
Let's start from the beginning.
I first though this is going to be simple procedure to set up all wallets and create multisig setup, but soon I realized I need to spend fair amount of time to download and set up everything correctly.
Mixin app is free so I downloaded latest version, and I knew it is based on well known signal messaging app and I knew they are asking for phone number registration.
This is the first thing I didn't like, but I found a way around it and I managed to registered account, that can be used both as messaging app and as cryptocurrency wallet.
I first though this is a cool idea since it supports Bitcoin, Monero and many other coins, but than I realized that I can't download and/or export private keys or seed words, that probably means that app is custodial.
I also can't set my own fees and I saw comments on google store from other people who complain that fees are outrages high.
I went ahead and changed settings in Mixin app to increase my privacy, but I had one small issue with trying to hide my phone number, and I will explain it later.
After setting up my PIN and changing settings in my main Mixing app, I created another account on different device that served as my Messenger Contacts and as Emergency Contact.
I tried finding account with username but it only worked after I typed user ID number.
I tested removing, adding contact again, changing username, and everything worked fine.
There is also Mixing desktop app, and I downloaded it and connected using QR code.
I wanted to test all Mixing products so for this purpose I used Morning Key as Owner Wallet and installation procedure was not complicated.
Paying $1 dollar for app is not a lot of money for this app but I decided to download free APK version available on website, since I used deg00gled phone for this testing.
This time I generated seed words and save them in offline in safe place, and I continued further.
I had a small problem with Mixing Safe because I tried to open with disabled option for phone number, and I couldn't create it until I returned and enabled sharing of my phone number.
I tried talking with Mixin chat support, but nobody was responding, maybe because of different time zones or they don't have enough people for this positions.
I went ahead creating Mixin Safe and I needed to pay 2 pUSD in crypto, and I selected USDT and overpaid fee microcents, but I was later refunded using EPC inside wallet.
First strange thing I notice in Mixin safe is that this is beta software and nobody should send more than $1000 worth of crypto?!
I would probably not send even $100 after reading this red banner, so I decided to send much lower amount for this testing.
Only two coins are available for multisig, Bitcoin and Litecoin so I had to proceed with LTC, but initially I wanted to try testing with XMR.
I managed to deposit LTC and create Mixin Safe, and after that I withdraw LTC back to my own non-custodial wallet, and I had to do all procedure in reversed way.
It all worked fine more or less, but I had few small bugs along the way and I had no support from their support and I had to figure it out myself.
My Final thoughts:Mixing Safe is an interesting concept but I have to say that I don't like the final product.
I really don't understand exact purpose for this much complications for beta software that can hold maximum $1000 with risk of losing it all because of some bugs.
Setting everything up is not easy and newbies would probably need hours to set up everything, if they ever manage to do it, and I don't think Mixing Safe is good for them.
Experienced Bitcoiners will never use Mixin Safe for multiple reasons, when they can create Multisig setup themselves in much safer and quicker way.
On top of everything I said, people using Mixin Safe will pay additional fees and they will have risk of exposing phone number and other personal details.
A lot more improvement is needed for this service to gain more popularity, and I won't name any competition services here, but easier alternatives use multisig setup or shamir secret sharing.