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A10 Networks' AX series has a good reputation for stability, and A10 has been in business for a long time, and they also has a good reputation for customer service. We use an AX 1030, and it has been great. It supports IPv6, which I would insist upon if I were buying a hardware platform. It ran around $20K, by the way. There are other choices, but I would give A10 a good look.