your 52.00 AGM weighs in at 10.2 lbs. the Motobatt weighs 11.I guess if cost were the real factor you would get an agm on ebay. I think you can find one for 35.00 or so.the extra pound? that's the lead plates your not getting with the 52.00 battery. to compare apples to apples, check out the Texas Battery Shootout article previously mentioned in this thread.
If you follow this link and scroll down there's close up illustrations of the terminals. http://motobatt.com/
Guys - my service manual and my owners manual both specify a 14ah battery, which apparently nobody is using. 10ah, 16.5ah... 10.5 lbs, 11 lbs... Does it really matter?