I have the 4.5" version. The install is simple. It gives you 4.5" of extra room. 
I very rarely have tall passengers (in fact, my wife is slightly vertically challenged teehee), so the reduced legroom on the passenger side isn't an issue for me. The increased entry space makes getting kids and baby carriers in and out of the vehicle MUCH quicker and easier, which is worth every penny i paid for them.
Calmini Cone Air Filter, PowerVault PV2 Muffler, OME Trooper Springs, Rancho RS9000X Shocks, 285/75R16 Nitto Grappler AT's, Pioneer DEH P8000R In-Dash CD, Amps and Drivers Built by Orion, Wires and Fuse Blocks by KnuKonceptz, Vibration Damping by BQuiet, Alarm System featuring Auto Start and Remote Windows, Yakima LoadWarrior w/Full Size Spare, Debadged/Custom Titanium Grill Logo, Tint (5% Rear / 20% Front), Steel Braided Brake Lines, G2 Painted Calipers