I have used Aubiose which is another hemp based bedding. However, I do find it a bit prickly so now only put Aubiose in their litter trays which I cover with a layer of fleece so the guinea pigs don't have direct contact with it. The other thing that put me off using Aubiose in their main area was that my guinea pigs were taking their veggies out of their food dish and eating them on the ground and their veggies were getting covered with Aubiose.
I would be wary of using Bliss as I notice the website says it is treated with Trus-STEED Stable Guard disinfectant. If your guinea pigs eat the same way as mine, they are bound to ingest some Bliss and am not sure if this disinfectant would be good for them .