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The PFtek is not a waste of time.The cakes aren't anyway,just break them up or use a cheese grater and you can spawn them on poo and do bulk. 

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The PF tek is not a waste of time.
It's for people that don't have a pressure cooker and for newbies to learn the basics ropes....following directions and learning to work in sterile conditions.
It's a great stepping stone...to bigger and better things.
PF cakes are also good for people that only wants to grow a few cakes...or people that can not have a large grow and it's great for Stealth growers.

BRF cakes are also a great way to have a fail safe from losing a strain in your collection.
I have used cakes several times so I don't have to try and find another print of a certain strain from someone else.

I have enjoyed growing cakes.
They can be alot of fun if you have success with them.
Spawning BRF cakes into horse poo has been very good to me.
I started doing a few cakes again recently. 

There is no comparing cakes to casings...Casings win every time.

The PF tek is pretty much a Classic.
There is no reason to knock it.
Yes there are alot better ways to grow mushrooms.
But the PF tek will always have a special place in the archives.