I've been riding 149 hollow-forged mids (50.5mm) off and on (more on than off) for a while now, running ACE classic bottoms and classic low tops, stock cups and they're delicious.
Nothing, not ACE low (with hards) or the new royals feel as good as these do....and I've all but written off thunders (too much wheelbite even when compared to lower trucks).
After fucking around with ti hangers and finding out the hangers are not interchangeable with the mid forged plate (pin doesn't sit center with non mid hangers) I started comparing both the forged mindy and regular forged ti, and prefer the height and turn of the forged mindy over all the rest.
Now the Royals are a hot second place (ACE low third), and I've praised them before and never had an issue with the grind before...but now, after skating the forged mids, the indys just grind better; on the same curbs, the royals (broken in) are stickier than the indys....even the ACE F1 lows grind a bit better than the royals.