HP Power Supplies

[AustinTxBob]

I have recently acquired a few HP power supplies and I am trying to decide if I should sell them or keep them.  Hp 6284, 6266B and a 6264B.  The specs on the last two are in here https://accusrc.com/uploads/datasheets/5019_6266B.pdf .  Currently I have a BK 1651, GW 3303S and an Elenco XP720 that I imagine I would continue to use.  How useful would these new (to me) supplies be?  I just don't want to get rid of something I could potentially need.

Thanks.
Bob