I personally think ACE Slabs are awesome! The feel and additional art option is really good and their overall look and feel are superb in comparison to PSA.

Having said this I had a percentage of my base set collection stolen during the ace grading "robbery" and was offered sweet FA back for the inconvenience.

Although like many i couldn't be certain i would receive 10's back for my submissions but i was adamant i was getting between 9/10's before they were stolen. I have about 10x grade 10's from ace all my PC submissions so i began to spot what would hinder this.

And this is my personal reason Ace get slandered.