Magic Item for Debate

I see a possible problem with the endurance of the beserkers part. All depends on how you view the spell working since it says "Consecutive castings delay the end of the spell - that is, put off the time when accumulate wounds take effect - but a body can only take a number of consecutive castings equal to its Size +2. Further castings have no effects" two different views are listed in this thread which i've added below.