It’s hard to give an objective answer
This will cover the period from 1958 to (I guess) 1965. So it’s pure silver-age storytelling, with all that implies. If you hate that style of comic, you’ll hate this and nothing I can say will convince you otherwise.
If you’ve enjoyed any other silver-age DC (and it’s quite a different beast to Silver-Age Marvel), you’ll enjoy this. By the standards of the time, a lot of the storytelling was pretty innovative. As the team was effectively just guest stars in Superboy at this stage, they weren’t subject to the rules that leading characters were: i.e. they could change, die, be bad guys and you weren’t actually sure if it was a ruse, and so on. Superman and Batman had to have a reset at the end of every story; the Legion didn’t. They had long running sub-plots, which was unheard of at the time.
The earlier stories by Jerry Siegel tend to be the worst, but the main writer in this book will be Edmond Hamilton, who was a god of pulp-era SF and threw out more wild ideas in one 12-page script than modern writers can manage in a decompressed 6-issue arc. He’s got more ideas than Grant Morrison on his very best day. Character building isn’t great, but then it’s silver-age DC so you don’t expect it. Read this for the far-out ideas, and you won’t be disappointed.
Here’s the litmus test. Look at the following picture and you will instantly know whether you want to read this book or not: