Even the Bosch stuff has declined in my experience.
I worked at a shop about 7 years ago that had an '83 VW GTI in for service. It needed an alternator. The owner of the shop was going to get an Ultima unit from O'Reilly and install it. Well, I yelled and screamed and kicked dirt and insisted that a Bosch Reman unit go into the car. Well, they bought it, and I installed it and it put out all of 9 volts. Did the job again with an Ultima, 14 volts. Great.

This is only one example, but I've had other lackluster experiences with Bosch reman stuff. I'm sure it's still a better bet than just about anything else, however I have yet to be disappointed by a unit that I've had rebuilt by my local auto electrics guy. Again, just one person's experience.