I know nothing about Jensen, maybe they're the exception, but I've bought so many reman alternators that were garbage, I will never buy another one. The ones that worked out of the box were almost always short-lived. The hassle is not worth the savings.
You're better off shelling out for a new one, or take your old one to a local shop and have it rebuilt for probably less than the reman, and it will be done right instead of the minimum and painted.