Yep, getting this too!
$20 kinda pricey. The part you need a lot of are the sponges: 50 sponges for $15 on Aero site or a bag of good generics on Amazon. This kit would be worth it if it came with the USUAL 3 bottles of fertilizer, but only one is supplied. Buy liter bottles from Aero when they have a sale. Plastic rings (from smaller plants) can go through the dishwasher and are reusable, hand wash the caps. Don’t need labels once you know your seeds or use parchment.
Mine came with 3 bottles and the labels are awesome too. Just letting you know.