I've been using Nature's Way 610mg that I buy from Swanson's.  Used to buy them locally, but they discount quite heavily, by about 40% and usually throw in a coupon when you order.  The service has been exceptional, and I've not had any problems with quality.  I'll include the link for what it's worth.

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I'm not familiar with the brand you are asking about, but I highly recommend Kudzu as a preventative.  It has been a lot more effective for me than the combination of Verap and Lithium and without the side effects that have lingered for almost 4 years since getting off of them.  The only side effect I get from Kudzu is a little gas.  It also helps to regulate blood sugar and has other beneficial effects.

Hope it's helpful. 

Jerry