They are regarded as the best of the "no-maintenance" type batteries. Top of the line lead-acid batteries will give you more charge/discharge cycles but only if you maintain them. With my woefully bad reputation for maintenance, I opt for the no maintenance type.
Sorry I cannot cite the exact volume but Sail Magazine ran a comprehensive article about 18 months ago which did a balanced job of covering the strengths/weakenesses of most battery options one will find on the market today...back subscriptions are available by calling Sail at 1-800-362-8433
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