Never been a huge Grado fan in the past 20 years. But recently acquired some new-to-me PS1000, and after reversing the "G" pads I have to say this hits all the right buttons for what I envisioned a "fun Grado" sound can be at its best. I didn't enjoy the sound with "G" pads in their normal orientation - it feels like the midrange is missing. Reversed G's (though slightly awkward) bring back the midrange and give a big bass boost that's definitely very overdeveloped, but also much more fun than it is obnoxious (still hits hard and fast enough). I tried flat pads (a favorite of mine for all older Grados) and they go a little bit further in this sonic direction, which is too far IMO. The "reversed G" pads hit the sweet spot for me - they act like slightly deeper flats. The sound has that classic Grado "snap" but also hits with a lot of extra weight without being too bright or fatiguing. I love 'em!
In the distant past I've had: SR-225, SR-325, HF-1 (#15 !!), RS-2, RS1 (twice), SR-200, HP-2 (three times!). The PS1000 are now my favorite Grado. Pictured below on a STAX headphone stand that had been holding a 009 for years. Sacrilege!