I like using them, they are compact to store and break down quicker than shavings when decomposing.
However, I will state that I only use them in a sawdust form.
I don't want any flames, and I don't want anyone saying "Well I have used them forever and have never heard of such an issue" when it comes to mini foals/weanlings they are curious critters and it is not unheard for them to eat/impact and die from the wood pellets, why, simply because they are foals and do silly things, even when they have good quality food, hay and minerals at available at all times. Despite what the bag says, not all animals spit them out, and it does not take much to be detrimental to a foal. When using them as a sawdust, The animals don't seem to bother with them, and some manufacturers state to thoroughly wt them down rather than to "mist" the top layer.
Do I like them, yes, in a sawdust form
Does the later happen, yes, unfortunately (there are other individuals that have had this happen to their young minis, it is not an isolated case)
This is only to give you input on the product, I still use the soft wood pellets, (but only as a sawdust). If you choose to use the product and you see your minis nibbling at it, it may be in your best interest to add water until they fluff into a dust, despite what certain manufacturers claim on the bag.
This is sort of like the cautionary statements on medication, it doesn't mean it will happen, very few may only ever experience these issues, but none the less it is only fair to let you know.