I ran the Hemi pump on the factory PS box for 1500 miles. Input shaft seal started leaking right off, changed it and didn't have any more issues for the 1500 miles.

I then swapped to a borgeson box. That's been in for the last 6,000 miles (of which nearly 20 hours of that is on track road course work, being 20 min sessions at a time mostly) with the Hemi pump. No problems.