Excellent quality!
If you don't know this already, irish moss is expensive.  This deal from Amazon is the most cost-effective that I've found (compared to Whole Foods and Mom's Organic).  I use this for a lot of my raw food recipes.  I like this better than lecithin.  My only note on this is to make sure that you properly clean the moss once it's "plump."  There's a weird smell to this.  But I'm a little germophobic, so I use my veggie wash on this too.
Rating: 5 stars