Has anyone used this disc brake kit??

Het guys, i've been looking ever since i bought my scamp in the spring for a cheap disc brake conversion kit and think i've stumbled upon the exact thing i'm looking for. My question is for you guys has anyone ever used this kit or this company? If so how well did it all go together?? how did you find the quality of the parts etc. etc.

Heres a link

http://www.resto-modtechnology.com/servlet/the-2131/63-dsh-74-MOPAR-|-CHRYSLER/Detail

Also it mentions for the a body that you will need to replace lower ball joints and upper control arms, Why? is that just so that you have the bigger ball joint? If so how do you tell if you have big or small, i know the nut size tells you but i forget what the big/small nut sizes are. My car is a 74 scamp with 4 wheel manual drums and the 7 1/4 which means it's small bolt pattern, i believe it should have the big ball joint but will have to double check to be sure, does that sound correct?? Thanks in advance for your help guys, you're always extremly helpful!!!

I am not sure but I think I remember reading some bad things about this company, cheap made in china parts, parts not fitting, rust, lack of customer service after the sale, I may have them confused with another vender, but I would do some serious research before I sent them any money