Rifle Scopes USO internal bubble level

at this point, it's pretty much my favorite feature of the USO. Definitely the best bubble level as it's so convenient and always in your sight picture. i use it on every shot
 
At First it was a little hard to get used to because it can be hard to see, but Like taliv I use it on every shot now that I have gotten used to it and love it.
 
Have you seen what it looks like? I have a SN3 3-17 35mm tube. It looks just like this example. I can barely see the bubble but it works. I dont have to move my face from the stock. My friend has a different USO model that is a smaller tube and had a bubble level installed and he cant see it.
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I have them in a few models and will echo others, yes its worth it. I have grown so used to using them that I find it annoying to have to look at the external level now. They did a good job of making it not stand out an be distracting. You have to shift your focus a little to see it and it doesn't distract from your sight picture. I got a ER-25 that didn't have it in a trade, it went in for the update straight away.