Saw the above posts - so I compared Yggy > Jodie versus Gumby > MicroZOTL2 (still on my head as I type this), both into my PS1000e. Personal biases may be at play here, because I've always preferred any generation of Grado I have owned, including my original SR60i, when they were plugged into a tube. The tube amplifier I used then was the Vali 2, which similar to the MicroZOTL2 is a low output impedance tube amplifier that does not sound like a "tube" amplifier. The sound of both amplifiers is oriented towards a more linear and fast sound.
But as fast as they are, they are not solid state - there is an immediately noticeable sound, for those like myself who like just a smidge of tube. Jodie does not sound as good to my ears as MicroZOTL2 through my Grado headphones. But that's not saying Jodie did anything wrong. It's a personal preference, and how I like to listen to Grado.
And if someone were to ask instead, how does Jodie compare directly against solid state options - there are a few warmer solid state options that I do like. Jodie is towards the cool side of the spectrum, ever so very slightly, while Moon NEO 230HAD is towards the warm side, again ever so very slightly. I did enjoy the Grado through the Moon. I also enjoyed the Grado through the Black Widow, though it was at the bottom of the usable volume, for my taste in preferred quiet listening.
To put it another way, the Jodie will not hide what the source is nor what the headphone you are playing through sounds like. Grado, as people here suspect, tends towards the higher frequencies. Jodie will not hide this. If you are a fan of the Grado, and how it sounds without assistance of warmth or a tube, you will like how it sounds on the Jodie, which does nothing to alter its characteristics. Otherwise, seek something else for your amplifier.
