I was initially impressed by the range of products Unigrade had on offer. I stopped my decision on Bitcoin Miner S19 Hydro. However, I was let down by their slow delivery time. It took more than 2 weeks for the product to arrive, and when it did, it was not up to my expectations. The customer service was also not very helpful when I asked about the delay. Nevertheless, I would still recommend Unigrade - the miner itself works perfectly.