Experiences with A10 AX series Load Balancers?

Does anyone have any experiences good/bad/indifferent with this company and their products? They claim 2x the performance at ½ the cost and am a bit leery as you can imagine. We are looking to replace our aging F5 BigIP LTM's and will be evaluating these along with the Netscaler and new generation F5 boxes. Regards, Bryan