I have made about 29 purchases between 2014 -2016 and I haven't had much to complain.
The purchases have been 16 - 50. My purchases have gotten stuck in customs about 5-6 times. Usually that's happened when Iherb had free shipping, or when one of the items inside had been around 25. I guess Finnish customs let packages go easier even when their price is over 22.
They usually give little free stuff with the purchases, like pens, magnifying bookmarks and tote bags, which are kinda cute. I had one of the pens open in the package and it had sprayed ink everywhere though.
I usually buy makeup, hair products for curly hair, beauty products, ingredients for flax seed gel, oils and supplements. They once sent me an argan oil that had a rancid smell to it and they refunded my money. I like buying from Iherb because many of the products are usually over two times more expensive to buy from shops in Finland than from Iherb.