These are really good, of course. The styling and poses are great, very dynamic. I have been having some issues with slightly mismatched mold halves, leading to some more serious seams than just seam lines.
Likewise, there have been some bubbles in the casts. Mostly these affect the bottoms, which are easy enough to conceal, but rarely there are voids left by bubbles on exposed areas like the upper arms. Occasionally some of the draping parts of the sleeves are missing.
I've even had some issues with the sprue attachments being in rather bad places, where it is difficult to remove the sprue and keep all the detail. A common example of this issue was on the right arm shoulder armor of the Davidians.
I've also had a hard time posing some of the big weapons on the Revengers. Sometimes the arms available make it difficult or impossible to fit the weapon around the torso and have both arms hold/support the weapon. I've been able to get by by swapping weapons and arms around between the models and using a lot of hot water to reposition or reshape the arms a bit, but I think these could be redesigned.
I would also love to see the Sisters backpacks redesigned with a peg-and-hole system rather than the current method of not having any sort of built-in attachment points at all. On that theme, for models that have long staff-like objects, such as Mona de Costemore, or Excelsiel the Immaculate, it would be nice if they could be cast with socketed detail bits to allow easy pinning, as the resin can be rather flimsy. I've got two Mona's and I wound up just replacing the shaft of her back-mounted icon with a bit of paperclip wire, and did a lot of pinning on Excelsiel's Oriflamme.
Complaints aside, I have been steadily assembling all the Sisters I have purchased, and I've got most of them primed and pre-shaded with a bit of Vallejo Xpress color, which I like to use to bring out detail. I've started on one of the Revengers with my planned color scheme, quartered white and burgundy. I think it will look pretty good!