I also bought a Silver Beatles album, but I don't recall some of these tracks. It's the first time I've heard "Thinking of Linking".
Yeah, the Quarrymen songs have been available on bootleg for years.
It has been many years since I listened to them, however, and I doubt it will be any time soon I bother listening to them again. Interesting to hear once but not much reason to hear them again.
Sound quality isn't always everything though - for years one of my favourite Beatles albums was Live at the Star Club Hamburg. I would play it over and over again when I was learning the guitar, as the songs on it were easier to play along with than later Beatles records. There's some great performances on the Star Club album and that comes across, despite the poor sound quality.