Right now if I am carrying AIWB I use an ACE case. It actually works great and it's as comfortable as I would imagine that it's going to be. It holds it right at the waistband for me, and it's tuckable.
I like carrrying OWB better but it depends on how I am dressed.
I don't believe the ACE case is perfect but it's good enough until I figure out which holster I want to try next.