It is legit. I use and recommend the official Tor browser and Orbot on Android. Just make sure you're getting them from official sources. This can be used in addition to your always on VPN so your ISP/Cell provider does not see that you are using Tor.
It's usually better for most people to leave their always on VPN connected so they don't accidentally reveal their IP when disconnecting/reconnecting.
If you need more anonymity, even from your VPN provider, use Tor only on desktop. I recommend a 2nd machine for this, brand new, that has never been associated with your identity in any way, including never logging in from your home network.