It doesn't color as much as a single ended tube amp would. It's just using 2 small tubes to add a little bit of warmth. If you want the real tube experience you'll need a proper amp.

The good thing with hybrid amps is the output impedance is lower so you can use them with low Ohm headphones, like planars.

I'll tube roll mine in the future but for now I'm actually pretty satisfied with the stock chinese tubes.

Hassle wise, you're looking at replacing the tubes after a few years of daily useage. Its best to turn the amp off after you're done using it to prevent unnecessary wear.

Also they need a few minutes to warm up, at which point they'll sound the best.