accuracy is what I'm really wondering.
Here is how I determine what fish to cull, etc.
I have 2 sets of XTools Grip-N-Weigh Scales. One set I've had all year, and the newer set I bought when Tackle Warehouse put them on sale for $40. The older set I have is pretty accurate (sometimes), for a total weight it's pretty close to 1/2 lb. For each fish, no matter how close it is, if I'm culling, the 2 smallest fish go on an Extra Edge culling beam (and that is the BEST way to weigh which fish is lighter, just my opinion).
I do use the Ardent Smart Cull culling system, and that thing is a life saver. The only thing that messed me up was when I culled a fish that was larger than my smallest fish - but it spit out about 3 shad/bream, and it cost me a few hundredths of an ounce which cost me a tourney....
The newest XTools scale I have, well it's off close to 1lb. The big fish I caught in the Georgia Jon Boat Championship weighed on it at 6.39... when I got to the "real" scales it weighed in at 7.49lbs. That one doesn't get used anymore.
I've got an OLD Rapala 15lb scale that is nearly dead on accurate, when it wants to work. I've tried Berkley scales and every one I've ever had has SUCKED. I don't buy the 50lb scales because I've found the 15lb to be more accurate... I mean who is going to catch a bass over 15lbs and not get it weighed on certified scales?