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They are pretty good. I have owned two sets of springs made by them. And as far as I know they still offer a FSJN discount per this post here: viewtopic.php?f=34&t=2865
Their website is not the best though, so I would call them to place your order.
I just installed their 4" kit on my 73 j series, I have no complaints about their product. Actually the lift seems a little more than 4" but I didn't measure before hight. I would give them a call as well couse their website is a little old school.