highscalability is a strange reposty/blogspam aggregation thing that takes information from other places and just puts it up on their own site. I think they started having some original content, but it's still mostly second hand reports of source material found elsewhere.
(Think of it more as somebody's personal notes about how things work and not an exclusive source of breaking news or architecture revelations.)
I find a lot of value in the summarization. Frankly, I'd rather read the notes on a 38 minute video and maybe watch the original source, rather than have to watch 38 minutes without knowing what the value will be.
Aggregation and filtering is value, too. Like HN, it's a channel with the expectation of a certain type of content. I can't possibly discover good tech talks (or any other content) entirely on my own.
The signal/noise ratio on highscalability is significantly good that it is well worth following - the quality and usefulness of the content is often much better than even HN, of which I have about a 1/100 ratio of click to ignore.
(Think of it more as somebody's personal notes about how things work and not an exclusive source of breaking news or architecture revelations.)