Maybe it's different there,but up here most rebuilt shafts are top quality.I've toured the facilty where they are rebuilt.
They are actually stronger,as they are machined oversized,with oversizes balls and races installed.They did have some problem with early ones years ago,as they were machining away too much,and removing the surface hardening on the bearing surfaces.That problem has been solved.
The only drawback I have found,is the boots seem fail sooner than the OEM ones.They still usually last 3-4 years,and 100K though.Not bad for $70.00
I have never broken one yet,even on well modifed ricers or tuned diesels.