Search the internet for descriptive information on resistance training home-gym systems from three different manufacturers (cite the three websites you use)

Overview

3 systems, 3 citations,  1 paragraph addressing each of these points for each of the systems. 

a) cost of purchasing

b) type of exercises

c) type of resistance

d) ease of operation

e) size of equipment

f) maintenance and repair

g) If you had a friend looking for a home-gym system, which one would you recommend? Why?