substrate jars prepacked??

so i found http://visiongrowkits.com. i am way opposed to grow kits, but i came across something on the site which seemed worth trying out. they sell 6 substrate jars for $15, whith everything already included, saying all you need to do is inject the spores.

FROM THE SITE:
Each Jar includes:
1.Medium Grain Horticulture Vermiculite
2.Organic, Fresh ground Brown Rice Flour
3.Mineral Water
4.Worm Castings
5.Bee Pollen
Jars are then Pressure Sterilized for 90 minutes at 15 PSI.

Think I should buy? they seem legit

 

It looks like a good deal. The only thing is, that when you make your own jars you know how clean and careful you are being. When you buy premade jars you have no idea.

 

Plus I hate all the ingrediants in those jars. I prefer 40/60 bird seed to rye berries & I would use distilled water.