I have no personal experience other than what I've read is the same as what you've read and oftentimes the endo's want the name brand so they know exactly what is going to be in it ea. month vs
. new batch lots, etc. in regards to inert ingredients!
I have been on Miralax laxative for 2 yrs now and the last generic
batch is a diff. mfg. and tastes just awful .. to the degree I called the pharmacist who called the mfg. and found out many have complained. I think that is an example ...