Spro Little John XL 70 (LARGER)

The Bait Monkey ate me up today. I went to Rogers, Arkansas and visited the Cabelas there and found some sales! The Spro Little John XL 70 (larger 7-9 ft. diver) was on sale for $7.29 (reg.$11.99) so I bought TWO! They rang up $12 but they gave them to me for tag/ sticker price. They had a few Storm Arashis for $1.88 so I got 5 of them and I hit the Academy and picked up a 6th Sense Flat Crush 75X that was on sale too! Anyway, There is not much information on Bass Resource or other forums yet the productivity of this larger Spro Little John. People rave about the "50" size and I want one of those too eventually, but what do you guys know about the productivity, fish-catching ability of the BIG Spro Little Johns? Any experiences? Special conditions? Just a cold water bait??