How secure it is? Although the description on the site is nice. As it is said on the site that, there is no email, and no ID checking, you just installed it and use it. It is more of decentralized Wallet. You control your funds by yourself without the participation of the wallet programmers.
https://samouraiwallet.comFor now, it is still safe to use since it doesn't have bad issues reported yet on GitHub. It's questionable why they still keep it (early access).
And another thing that I noticed is that they release new updates on Playstore but look at the open-source below
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https://github.com/Samourai-Wallet/samourai-wallet-androidIt seems they are planning something because they don't release the open-source one on Github so we can't tell if we can trust them. So I think it would be better to use a different wallet than using this wallet.