OCD with the Letters in the Right Order!
Well Do you own Season 1? Do you plan on getting Season 1 if not?
Lets asume you own..
The thing that is most important is the Crossover kits. They allow Season 1 to be forward compatible with Season 2. Thats the bigest one for me as i have all of season 1.
If youy dont own the core set, then that whole addon bundle is worth it as you get the upgraded figures.
I do not own anything in the series at this point. I am unlikely to buy the old stuff as even the new stuff may not get played and I am trimming some of my compulsive collecting habits a bit.
I would consider an entire package if it was inexpensive, but this would already be at 150 pounds (more in USD) if I went for all in the KS campaign.