Ebay lift Blocks?

i was surfin on ebay for some peices to my lift and i found these blocks. has anyone used these before? i dont know if there is a difference since its aluminum but let me know some feed back.

http://cgi.ebay.com/ebaymotors/3-Li...39:1|66:2|65:12|240:1318&_trksid=p3911.c0.m14

 

Aluminum blocks break, whether its lifted or lowered. If youre lifting, go with lift leafs, blocks cause axle wrap.

 

They advertise that the aluminum is stronger, which is BS for this kind of application. Dont buy

 

Those blocks look hollow...not good. If you want to lift the rear why not go with an add-a-leaf (AAL)? It would add more functionality to your rig!

 

thanks, thats what i'm going to do. i actually found some at a junk yard for 20 bucks a peice! sometimes you get lucky i guess.