Sorry, I meant to get back to you sooner.
Well for the moment I use the cap basically as a distribution block for my electronics. Overall though, I would skip it next time if I were to reinstall everything. I haven't noticed any difference with or without it to tell you the truth. My lights rarely dim (Then again I don't bump my subs either), but the most useful part of it though is the display, which tells me exactly how many volts are currently in my battery.
My opinion: skip it.