I am running Icon piggy back 2.5" shocks in the rear along with their overland series 3" rear coil spring and their rear hydraulic air bump stop. I have been running this set up in the rear for about 1 year. I decided to go with Icon because of their reputation, durability and fair price.
The Icon piggy back 2.5" rear shock is a product for the price. Some people get what is known as the "Icon squeak", I am fortunate enough not to have it.