Wow! So, not worth doing, that is for sure! Thank you for sharing. Glad your machine isn't ruined. You may have saved a few people some big bucks! I mean big sucks. LOL!
Here is my experience with the Sam Ink inks in my L25500:
We ordered a set of cartridges to test before committing to the bulk ink. We switched inks and noticed a change in colors, so we created a new profile for our common medias with the new inks. For the First week everything was good, had crisp prints and it seemed to last longer than the HP inks (most likely just our profiles). At the end of the week we left it on over the weekend, and on Monday noticed that we had alot of nozzle clogs. We cleaned the heads and recovered most of them, but by the end of the week they were pretty much all clogged and we weren't getting any prints out of it. We tried to do everything we could to recover the heads, and finally replaced them with some spares we had, with in one week those were clogged. We finally put in a brand new set of Heads and returned to HP Inks after flushing the system everything is printing normal and we will never try that again.
I tried to give it a shot for nearly a month thinking that is was other things but finally came to the conclusion that the inks were to blame and we weren't going to look back.