Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - General Potion Balance?

So I am wondering what everyone thinks about Potions. If you decide to reply here are some questions you could consider when making your response.

1) What are you opinions on the balance of Healing Potions?
a) How do they scale in usefulness from Level 1 to Level 20?
b) Are they too abundant or too scarce?
c) How do they compare to healing spells?

2) What changes would you suggest to Potions?
a) Should they heal more? less?
b) Should they have side effects?
c) Should they cost more or less AP to use?
d) Should they cost more or less Gold to buy?

Keep in mind PennyBun Mushrooms can be used to make Small Potions and with enough Crafting 2 Small Potions can make a Large Potion.

I have seen people say they are very powerful from Levels 1-10, but I haven't seen any mention of them past that.