Hi Dave. I have Alpkit stem cells and a fuel pod. At least I think that's what they are called. I also have a double ended dry bag. VERY handy. The quality is very good for the price. As good as my Revelate stuff. Importantly their customer service is exemplary, so if you are not 100% happy, I'm confident they would be amicable.
They do have stock problems sometimes. But in their favour: they keep their prices low and as a result, stock flies out of their warehouse. Who wants to sit on stock anyway?
I've bought loads off them. One of my favourite suppliers at the moment. Happy shopping.