I don't believe the auto parts stores carry any coil spring spacers, so this type of kit may set apart from those because of it.
These budget kits are okay, we used a 2" block in the back of our '98 XJ with no problems, more onroad use than off.
Take what you read about AAL's on that site with a grain of salt, they're not all bad. The thinner full-length add-a-leaf kits don't roughen the ride while they do add some lift, and make the spring pack last longer. I generally cut up a set of stock springs and use one of the long leaves added to each spring pack to add around 1.5" of lift.